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- bash - What does $ (command) do? - Ask Ubuntu
Bash performs the expansion by executing the command in a subshell environment and replacing the command substitution with the standard output of the command, with any trailing newlines deleted
- bash - How do I add environment variables? - Ask Ubuntu
To set an environment variable once, use the export command in the prompt, not in a shell script: $ export THEVAR= example The variable will be set for the rest of the shell session or until unset To set an environment variable everytime, use the export command in the bashrc file (or the appropriate initialization file for your shell) To set an environment variable from a script, use the
- Whats is the difference between gt; and gt; gt; in shell command?
Could someone explain to me the difference between > and >> when using shell commands? Example: ps -aux > log ps -aux >> log It seems the result is the same either way
- bash - What is the meaning of at the end of a command? - Ask Ubuntu
What is the terminator ? The trailing operator at the end of a command is used to put commands into background This is actually a standard syntax specified by POSIX standard: Asynchronous Lists If a command is terminated by the control operator ( ' ' ), the shell shall execute the command asynchronously in a subshell This means that the shell shall not wait for the command to finish
- bash - \r added end of the script command - Ask Ubuntu
The \r issue suggests you have edited the script file on a Windows machine Windows uses \r\n as the line terminator while Linux (and most other operating systems) use \n alone When you edit a file in Windows, Windows will add \r to the end of the lines and that will break your scripts So, first remove the \r: sed -i 's \r g' script sh The next issue is that your script isn't doing what you
- What does gt; 2 mean in a shell script? - Ask Ubuntu
Bash command that prints a message on stderr echo > 2 “some text” what does it mean in shell scripting In your command posted, both messages for stdout and stderr will appear on your terminal screen However some applications will separate the stderr messages and perform special processing
- bash - sudo: source: command not found - Ask Ubuntu
The problem is that source is a bash build-in command (not a program - like ls or grep) I think one approach is to login as root and then execute the source command sudo -s source etc bash bashrc
- bash - How to check if a value is greater than or equal to another . . .
22 #! usr bin env bash while true; do if xprintidle | grep -q 3000; then xdotool mousemove_relative 1 1 fi done Currently I'm able to check if xprintidle is equal to 3000 and then if it is, execute xdotool But I want to check if xprintidle is greater or equal than 3000 and then execute xdotool How can I achieve this?
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