Apr 3, 2012 · The shell splits tokens based on the contents of the IFS environment variable. Its default value is \t\n; i.e., whitespace, tab, and newline. Expanding "$@" gives you a pristine copy of the arguments passed. Expanding $@ may not.

What is the difference between =, == and -eq in shell scripting? Is there any difference between the following?

Feb 15, 2013 · Also note that @bluescorpion says in the comments that Windows 10 needs a trailing backslash, as in check_output("dir C:\\", shell=True). The double backslash is needed because \ is a special character in python, so it has to be escaped .

But after doing some comparisons, using dash, busybox shell, bash and ksh, here is my average result: Comparing time PExp vs Case method under bash : 634.71% Comparing time PExp vs Case method under dash : 878.87% Comparing time PExp vs Case method under ksh : 217.95% Comparing time PExp vs Case method under busybox : 752.42%

Jan 6, 2012 · Since a variable name can't start with a digit, shell doesn't need {} around numbered variables (like $1, $2 etc.) unless such expansion is followed by a digit. That's too subtle and it does make to explicitly use {} in such contexts:

Aug 30, 2010 · Shell compatibility note If your script has arrays and you're trying to make it compatible with as many shells as possible, then consider using typeset -p instead of declare -p . I've read that ksh only supports the former, but haven't been able to test this.

Jan 6, 2010 · You can find all of this info and much, much more, without even leaving the shell, by typing: info -f "bash" -n "Shell Parameter Expansion" Or use pinfo to add a little color. pinfo -f "bash" -n "Shell Parameter Expansion" A good read: pinfo bash (navigate to Basic Shell Features) To produce this cheat sheet:

Mar 15, 2009 · In the sys package, you can find a lot of useful information about your installation:. import sys print(sys.executable) print(sys.exec_prefix)

Jan 5, 2012 · I want to return the value from a function called in a shell script. Perhaps I am missing the syntax. I tried using the global variables. But that is also not working. The code is: lockdir="somedir"

Here I have demonstrated an example to run python script within a shell script. For different purposes you may need to read the output from a shell command, execute both python script and shell command within the same file. To execute a shell command from python use os.system() method. To read output from a shell command use os.popen().