Unix / Linux: Include Header in Grep Result
Objective: Always include the header line when using grep. In other words, do not perform pattern matching on the header, but only perform pattern matching on the body (from line 2 onwards).
Tag Archives: linux
Unix / Linux: Get List of Usernames from /etc/passwd
Objective: Get the list of usernames defined in the /etc/passwd file.
Linux: Get Username from UID
Objective: To get a user’s username given his id or UID.
Linux: Process List Sorted by Memory Usage
Objective: List running processes on Linux and sort them by memory usage.
Unix / Linux: Read File from Line Number
Objective: Read a file from a specific line number or skip the first x numbers of lines.
Linux: Get Kernel Version
Objective: Find out the kernel version / release that is currently running on any Linux distribution.
Linux: Single Instance of Shell Script
Objective: Ensure that only a single instance of a shell script is running at a time on Linux.
Linux: Run Last Command as Sudo
Objective: You wanted to run a command as root but you forgot to use sudo. There is a useful shell shortcut (using Event Designators) to re-run the previous command under sudo.
Linux: Alias with Variables / Arguments
Objective: The alias command can be used to launch any command or a group of commands (inclusive of any options, arguments and redirection) by entering a pre-set string. But how to pass an argument to alias or let an alias handle a variable?
Unix / Linux: Remove ANSI Escape Sequences
Objective: Remove ANSI escape sequences from a input file on UNIX / Linux.
