Dec 22, 2010 · $ command one && command two the intent is to execute the command that follows the only if the first command is successful. This is idiomatic of Posix shells, and not …

Sep 27, 2015 · What's the difference between <<, <<< and < < in bash? Here document << is known as here-document structure. You let the program know what will be the ending text, and …

155 Quoting from man bash: -c string If the -c option is present, then commands are read from string. If there are arguments after the string, they are assigned to the positional parameters, …

Mar 19, 2020 · What is [? [ performs a test. The purpose of [ is to test something (e.g. if some file exists) and to return exit status zero if the test succeeds, non-zero otherwise. [ is a command. …

By default, Bash does not do this. This default behavior is exactly what you want if you are using Bash on the command line you don't want a typo to log you out! But in a script, you really want …

Jan 30, 2017 · I found that on Bash 3.2.57, using declare -i x and then doing x+=1 in a loop (doing other thing), x did not increment more than one time. The let and (()) methods worked fine.

Jan 14, 2010 · No, they are not the same, and yes, linux shell programming books should have significant portions or be entirely about bash scripting. Ubuntu is a distribution of linux which …

May 4, 2010 · Also note that each bash session will load the full history file in memory, but even if your history file grows to 10MB (which will take a long, long time) you won't notice much of an …

Aug 27, 2011 · Shell config files such as ~/.bashrc, ~/.bash_profile, and ~/.bash_login are often suggested for setting environment variables. While this may work on Bash shells for programs …

Dec 14, 2012 · In bash script, what does #!/bin/bash at the 1st line mean ? In Linux system, we have shell which interprets our UNIX commands. Now there are a number of shell in Unix …