[SOLVED] how is bash set command used

dspjm · 12-08-2012, 07:57 PM

Within the manual, I know that set command is used to set options for bash, but it says when no options are specified, values are printed, while I saw lots of variable values and a sequence of statements, I didn't figure out how is that different from env command. some options such as set -C, I don't know how to find out if it has been set.

and in its syntax
set [-abCefmnuvx][-h][-o option][argument...]
what does argument mean while i don't see any operations would need it.

Thanks for answering.

rigor · 12-08-2012, 09:40 PM

In the man page for bash that is installed in my Linux sys, it says that the currently set options are kept in $-

Code:

echo $-

does indeed show me the options which are currently set.

However, even though the bash man page says that the set command without options displays the shell variables, for me, it shows not only the shell variables, but defined shell functions as well. That's how it's different from the env command.

rknichols · 12-08-2012, 11:57 PM

The env command shows only the variables that are exported to the environment. The set command shows all variables, both internal and exported.

rigor · 12-09-2012, 12:16 PM

Good point! ( well, variables and functions )