Linux: Use Cat Command to Write to File
Explains how to use here document and the cat command to write to a file on Linux or Unix.
Tag Archives: shell
Linux: Get Number of Days since 1970
Calculate or get the number of calendar days since 1970 on Linux using the date command.
Unix / Linux: Count Occurrences of Character in String
Objective: Count the number of occurrences of a single character in a string.
Unix / Linux: Redirect of stderr Not Working
Explains stderr redirection pitfalls and common errors. For redirections to work, order is important and they are evaluated from left to right.
Unix / Linux: Change File Owner from One User to Another
Objective: Change ownership of all files belonging to a given user, within a targeted directory, to another specified user on Unix / Linux.
Unix / Linux: Display Read Prompt in ANSI Color
Objective: The read shell command is used to read a line from standard input with an optional prompt. How to specify ANSI color sequences for the prompt?
Unix / Linux: Shell Stopwatch
Objective: Time an event or something using the shell on Unix or 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.
Special Shell Variables
As I always have a tendency to forget the special variables used in shell scripts, I am going to document down the variables here.
Command Line Calendar
How often have you wanted to take a quick glance of the calendar in your desktop? You may need to click a couple of dozen of times on your desktop if the period your are interested in is more than a decade back.
