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The shell is Unix's command-line interface. You can type commands in a shell interactively, or write scripts to automate tasks. Use this tag for questions applying to /bin/sh and most compatible shells (ash, bash, ksh, zsh, …). For shell scripts with errors, please check them in http://shellcheck.net before posting here.

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Shell variables always belong to the current shell. When you spawn a subshell, it is a different shell, and hence has its own set of variables. In your case, you are running the subshell using … (......), so bash arranges that the subshell initially gets a copy of all variables of the parent shell, but that's it already. In particular, changes in the variables are not copied back when the subshell …
answered May 16 '18 by user1934428
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You want a variable inside your function which, once set, keeps their value. Since this can be done only with a global variable, you need to give it a different name, for instance: xtest(){ typeset …
answered Sep 24 '18 by user1934428
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As RalfFriedl already explained, whether or not this can have some impact, depends what is actually executed inside the sourced script. Since you didn't tell us the content of that script, there is no …
answered Aug 31 '18 by user1934428
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I would put the logic upside down: # Note that the variables 'master' and 'integration' are NOT defined yet if [ -f '.vcs.json' ]; then master="${`read_json -f .vcs.json -k git.master`:-master}" …
answered Sep 12 '18 by user1934428
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It's just a consequence of the old saying that "one man's data is an other man's program". Computers are built based on the Von-Neumann-Architecture, and this means that there is nothing inherent in f …
answered Mar 9 '18 by user1934428
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env_script.sh) you are asking bash to run the content of this script as commands, i.e. to execute a program with the funny name X=5. Hence, the correct way to bring the definitions into your shell would … invoker. In short, if a shell needs variables to be set, and the settings are defined in a separate file, it needs a source command to import those. …
answered Sep 19 '18 by user1934428
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What do you mean by opening a new prompt? There are several ways in that Zsh runs something automatically: On starting a new shell, several startup files are executed (depending on how the shell is … new shell with tracing enabled (-x) and analyze the output. This should show you, where the mv comes from. …
answered Aug 15 '17 by user1934428
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grep (and egrep or its modern equivalent grep -E) is your friend: man grep See the -v option. Here: grep -Exv '[[:blank:]]*[0-9]+c[0-9]+[[:blank:]]*' file would filter out lines consisting of c …
answered May 4 '15 by user1934428