06-16-2008
shell programming / aliasing / set -f
Here's my opportunity.... I want to turn off the * expansion, execute the shell script and have it see the arguement with the * and not all the filenames, and then set +f once the script is executed.
1) I have an alias set as follows:
alias scp='set -f; /opt/dir1/dir2/script.sh ; set +f'
of course this fails due to the way aliasing works.
scp /dir/dir2/* the * does not get passed correctly to the binary because of the alias being set and the "; set +f" being aliased... so...
I do:
alias scp='set -f; /opt/dir1/dir2/shell.sh'
and thus
scp /dir/dir2/*
works perfectly because the set -f is performed at the current shell level before executing /opt/dir1/dir2/shell.sh thus what is passed to my script is the string "/dir/dir2/*" and the splat is not expanded... so
All's well except that the set -f remains in effect. Is anyone away of how I can get the 'set +f' executed once the script is finished?
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RBASH(1) General Commands Manual RBASH(1)
NAME
rbash - restricted bash, see bash(1)
RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a file name containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO
bash(1)
GNU Bash-4.0 2004 Apr 20 RBASH(1)