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It expands to the command-line parameters passed to the script. However, it's wrong; it should be in double quotes, like "$@"

vnix$ cat >script
echo args: "$@"
for f in "$@"; do echo "arg: $f";...

The manual page for your shell documents these.

$$ is the PID of the current process.

$? is the return code of the last executed command.

$# is the number of arguments in $*

$* is the...

ps -ef | grep identify |
while read line; do
# for example, split on whitespace once we have one line
set -- $line
case $5 in 13:33) echo "$@";; esac # just as an example
done

You can...

Experiment to see.

vnix$ n=1
vnix$ echo $($n)
bash: 1: command not found
vnix$ n="date"
vnix$ echo $($n)
Wed May 21 20:39:00 EEST 2008

So it uses the value of $n as a command. (It's the...

The ^M is a DOS carriage return. Use a tool like unix2dos to clean out any DOS line endings from the script file.

var=${var}morestuff

Maybe you even want a newline between the old value and morestuff?

var=${var}'
'morestuff

That looks weird but it works.

And apart from the fact that you need to double the equals sign in the condition, does it work?

And the backticks don't fit that definition?

Anything you can do in a script, you can do on the command line, anyway.

For the general solution, xargs is probably closest to what you have in...

Probably it does, but there are many implementations, so if it is undocumented, you will have to experiment, or look at the source.

rexec is insecure and should be replaced by ssh if at all...

Or even just run the command once.

perms=`ls -l "$1" | cut -f1`
case $perms in
?r?????????) echo Read for owner;;
esac
case $perms in
??w???????) echo Write for owner;;
esac

etcetera. ...