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shell - Difference between sh and Bash - Stack Overflow Shell - "Shell" is a program, which facilitates the interaction between the user and the operating system (kernel) There are many shell implementations available, like sh, Bash, C shell, Z shell, etc
What are the special dollar sign shell variables? - Stack Overflow $! is the PID of the most recent background command $0 is the name of the shell or shell script Most of the above can be found under Special Parameters in the Bash Reference Manual Here are all the environment variables set by the shell For a comprehensive index, please see the Reference Manual Variable Index
Difference between ${} and $() in a shell script - Super User $(command) is “command substitution” As you seem to understand, it runs the command, captures its output, and inserts that into the command line that contains the $(…); e g , $ ls -ld $(date +%B) txt -rwxr-xr-x 1 Noob Noob 867 Jul 2 11:09 July txt ${parameter} is “parameter substitution” A lot of information can be found in the shell’s man page, bash (1), under the “ Parameter
What is the purpose of in a shell command? - Stack Overflow 180 command-line - what is the purpose of ? In shell, when you see $ 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 only found in Bash It intends to prevent the running of the second process if the first fails
How to set environment variables from . env file - Stack Overflow 116 Let's say I have env file contains lines like below: USERNAME=ABC PASSWORD=PASS Unlike the normal ones have export prefix so I cannot source the file directly What's the easiest way to create a shell script that loads content from env file and set them as environment variables?
shell - How do I set a variable to the output of a command in Bash . . . But as bash is a shell, where the main goal is to run other unix commands and react on result code and or output ( commands are often piped filter, etc ), storing command output in variables is something basic and fundamental Therefore, depending on compatibility (posix) kind of output (filter (s)) number of variable to set (split or interpret)
shell - Whats the difference between . bashrc, . bash_profile, and . . . The main difference with shell config files is that some are only read by "login" shells (eg when you login from another host, or login at the text console of a local unix machine) these are the ones called, say, login or profile or zlogin (depending on which shell you're using) Then you have config files that are read by "interactive" shells (as in, ones connected to a terminal (or