alvin alexander
Nodes for the term “unix”
A Scala shell script example (and discussion)
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How to display the contents of a gzip/gz file
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Linux alias command: How to create and use Linux aliases
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How to use the Linux ‘scp’ command without a password to make remote backups
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How to create a symbolic link in Linux
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Linux: Case-insensitive file searching with locate and find
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A shell script to download a URL (and test website speed)
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Unix: How to redirect STDOUT and STDERR to /dev/null
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How to use the Linux 'lsof' command to list open files
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Linux/Unix: How to edit your crontab file with “crontab -e”
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Linux process memory usage: How to sort ‘ps’ command output
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Linux crontab “every X minutes or hours” examples
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How to access a USB drive while in Mac single-user mode
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Linux: Recursive file searching with `grep -r` (like grep + find)
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A Linux shell script to rename files with a counter and copy them
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A Unix shell script to clean all SBT subdirectories
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More Linux find command examples
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Unix/Linux shell script reference page (shell cheat sheet)
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Unix `sed` examples: how to insert text before and after existing lines
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How to un-tar (extract) one file from a tar archive
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The Linux 'rm' command (remove files and directories)
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How to read Unix/Linux shell script command line arguments
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How to use the Linux sed command to edit many files in place (and make a backup copy)
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Teleport: The Unix/Linux ‘cd’ command, improved
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Unix/Linux: Changing many files with the same multiline string pattern
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How to use the Linux sed command to delete a range of lines
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A crazy sed script to convert HTML code to LaTeX
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MacOS: How to batch-resize images with the ImageMagick mogrify command
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How to run a Unix shell script from the Mac Finder
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Wanting a Unix alias that takes a command-line argument (shell script, actually)
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How to replace newline character with sed on Mac OS X (macOS)
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A Scala CLI 'watch' script
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Linux shell script: while loop and sleep example
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How to redirect Unix/Linux STDOUT and STDERR to the same file/location
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A Unix shell script to rename many files at one time
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A Unix/Linux shell script to make a quick backup of a directory
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How do I sort a Unix directory listing by file size?
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How to sort Linux ls command file output
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Sorting Unix 'ls' command output by filesize
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Linux shell script date formatting
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Applescript: How to open a PDF in Preview and go directly to a page
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How to fire MacOS notifications with AppleScript and Scala
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Linux: How to get the basename from the full filename
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How to make an offline mirror copy of a website with wget
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How to process every line in a file with a Unix/Linux shell script
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macOS ‘ls -l’ command: What does ‘@’ mean?
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Linux sed command: Use sed and wc to count leading blanks in a file
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Raspberry Pi camera module shell script
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vim tip: How to configure vim autoindent
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The vim “delete line” command
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A Linux crontab mail command example
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An example Linux crontab file
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A sed command to display non-visible characters in a text file
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Shell script error: bad interpreter - No such file or directory
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How to remove extended ASCII characters from Unix files with the 'tr' command
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Remove non-printable ASCII characters from a file with this Unix command
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Unix/Linux: Find all files that contain multiple strings/patterns
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How to catch the ctrl-c keystroke in a Scala command line application
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The old SCO clock
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Unix: How to find files with multiple filename extensions
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Unix/Linux: How to use sudo and curl to download and install a command
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How to use one version number variable in many Linux shell scripts
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A Linux shell script that shows find and tar with multiple image filenames
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An Apache name based virtual host (NameVirtualHost) tutorial
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Unix/Linux ‘cut’ command examples
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A "tar extract multiple" tip - How to extract multiple files from a tar archive
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Linux backups: Using find, xargs, and tar to create a huge archive
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How to use multiple filename search patterns with Linux find
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Linux: How to find files open by a Linux process (lsof)
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Java exec: How to execute a system command pipeline in Java
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Unix/Linux ‘alias’ command examples
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Perl “exec”: How to execute system commands
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How to run a PHP script from a Unix command line
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Linux pipe command examples (command mashups)
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Using find and grep to print lines before and after what you’re searching for
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AppleScript/Unix: How to get the current MacOS foreground application name
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How to use AppleScript to display a dialog from the MacOS Unix shell
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Linux `mkdir`: How to create multiple directory levels at one time
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A collection of 75+ free Linux tutorials
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The Unix/Linux `htop` command
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How to set the MacOS Terminal title | Mac Terminal titlebar
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How to run an AppleScript from the Mac OS X Unix shell
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How to use the Linux cut command with a field and delimiter
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A shell script to change between MacOS dark mode and light mode
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An `egrep` example with multiple regular expressions
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grep multiple patterns: find files containing multiple patterns
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Jeyes, a Java version of Xeyes
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How to easily determine the blocksize of a filesystem
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The time Steve Jobs spoke at Unix Expo
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Mac OS X: Unix sed commands I use to clean MacDown HTML output
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A Linux shell script (and commands) to find large files
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How to use the Linux top command
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Unix find command: How to move a group of files into the current directory
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Handling spaces in Linux shell script input (and for loops)
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A Bourne shell script that loops through all files in the current directory
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How to run a sed command from the Linux command line
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Debug Linux shell scripts with ‘-x’
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A Linux wget command shell script
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How to download files with the Linux wget command
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How to use `curl` to get headers from a URL
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Linux free memory: How to show the free memory on a Linux system
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A sample MacOS Bash startup file (.bash_profile)
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Linux gzip: How to work with compressed files
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My vi/vim tutorial goes over 200,000 views
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Linux crontab example: How to run a program as another user
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How to convert vi/vim tabs to spaces
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Use sed to modify files in place
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Linux sed command: How to modify the content of many files
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Linux ‘find’ example: How to copy one file to many directories
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The Linux `chown` command
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Linux ‘find’ command recipes
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Linux ‘locate’ command examples
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A Linux mail command tip
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Linux shell scripts: How to increment a counter in a shell script
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How to read and write from a file in a Linux bash shell script
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Using the Linux ‘find’ command with multiple filename patterns
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sed on macOS: How to append multiple lines of text to an HTML or XML file
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The Linux wc command (word count)
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The Linux `chmod` command
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Linux find: How to search multiple directories with find
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Linux ‘find’ command: How to find and copy files
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Linux ‘find’ command error: missing argument to -exec
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grep reverse: how to reverse the meaning of a `grep` search
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Free Unix/Linux and vi/vim cheat sheets
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Common vi/vim commands I'm trying to remember
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The vim “delete all lines” command
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Linux find command: How to find files not matching a pattern
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Error message: mv cannot unlink remove file, operation not permitted
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vi/vim editor tutorial has 175,000 views
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A Bash ‘for’ loop to iterate over a file that has blank spaces in its lines
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Ruby “execute shell command” examples
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Linux file searching: Search for text in files with find and grep commands
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Hints for writing Unix tools
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How to make a conditional decision in an Ant build script based on operating system
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MySQL: How to start a MySQL server and client on a non-standard port
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An example vim vimrc configuration file
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Two more Textmate commands (capitalize, CSV to list)
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Nginx configuration: How to drop the query string on a rewrite
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The Linux ‘head’ and ‘tail’ commands
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A Linux “sort by field/column” example (‘sort’ command)
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The vim cut and paste commands
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Old Unix command-line humor
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A Perl script to convert Nagios/Unix epoch time to a human readable format
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Where is Perl looking for modules to include?
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Memo: Note-taking, Unix command-line style
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Epoch Converter
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How to configure an iptables firewall on CentOS 6
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Show unique list elements with the Linux sort -u command
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New, free Introduction to Unix and Linux tutorial
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A long Unix "file management" tutorial page
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vim backup files - how to move
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vi/vim arrow keys
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vi/vim backspace key
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The vim copy and paste commands
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The Vim end of line command
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The Unix compress command
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The Linux pwd command (and Linux command line prompts)
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The Linux who command
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The Linux file command
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The Linux more command
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The Linux copy command (cp)
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Move Linux files and directories with the mv command
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Linux chmod - how to make a Perl script executable
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tar gzip example - How to work with files that are tar'd and gzip'd
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A better test for detecting Unix operating systems in an Ant build script
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Linux du command man page
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Linux chmod command man page
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Linux rm command man page
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Linux mkdir command man page
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Linux mv command man page
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Linux scp command man page
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Linux cp command man page
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New release of the Teleport command
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Linux shell script heredoc example
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Tue, July 16, 2002
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Linux sendmail example
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Thu, May 22, 2003
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A Linux find, mtime, exec ls, and sort command
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Linux - grouping commands in parentheses, aliases
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Sat, Jul 12, 2003
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Linux locate and ls command examples
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Wed, May 5, 2004 (Crazy sed guy)
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Wed, June 23, 2004 (Several new Unix/Linux tips)
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Thu, Jul 12, 2007 (Using Windows on a PC is a form of masochism)
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Wed, Jul 18, 2007 (Denali, POSIX sort command)
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Recent Unix, Linux, and programming tutorials
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Nagios error code 127, make sure your plugin actually exists
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A perl function that runs a Unix command and returns its exit status
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How to install Apache with the mod_proxy module
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Securing the Drupal cron.php script
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Linux df command man page
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How do I show Linux disk space information?
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Linux crontab man page (crontab file format, section 5)
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The Unix and Linux ps command
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Linux find, multiple directories, and exec grep
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Just learned about Linux locate (Mon, Jun 23, 2003)
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Linux ls command - How to show the permissions and size of a directory
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Linux background process - the nohup command
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sed command example - extract lines from a file
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Linux backups - using pax instead of tar to create a large backup
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A Perl CGI environment variables script, and mkdir -p (Tue, June 29, 2004)
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Linux mail - a Linux shell script to send mail
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Linux tee command - redirect output to two directions at once
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Linux tee command tip (Tue, July 27, 2004)
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Record your Linux command line with the script command
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My Linux/Cygwin command prompt
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Free Unix/Linux cheat sheet (pdf)
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Linux tutorial, part 1
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Linux tutorial, part 2
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Linux tutorial, part 3 (ssh, cd, ls, cp, mv)
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Linux tutorial, part 4
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Linux tutorial, part 5
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I like my platform freedom
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More Linux grep command examples
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Linux cp command examples
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Linux mv command examples
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Linux cat command examples
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Linux mkdir command examples
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Exploring the Linux locate command
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The Linux more command
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Some Linux tar command examples
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A Linux shell script to rename files
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Finding files that Spotlight is missing
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Perl pipe - Reading from a pipeline with Perl
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Linux find command - reverse the meaning of a file search
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