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Oh, and another alternative is to give the vendor a non-root account and have them use sudo with restrictions in /etc/sudoers. The vendor might not be willing to play along with this, though.

Only by running separate sshds on all network interfaces.

The better way to do this is AllowRootLogin without-password or AllowRootLogin forced-commands-only, then generate a public/private...

dd if=/dev/zero of=dummyfile; rm dummyfile
Which just fills all available disk space with zeroes. You might want to follow withdd if=/dev/urandom of=dummyfile; rm dummyfile to overwrite with random...

SIGPIPE is sent when the receiving end of a pipe or socket has been disconnected. If you ignore SIGPIPE (see sigaction()) you will get a trappable error EPIPE instead.

Other than that, you want...

You should be able to read any variable that has been set at that point. Assigning to it won't work because the pipe forces the while loop to run in a subshell; assignments will be visible within...

That won't work because you need to tell it the address pattern match uses # instead of /. The solution:sed -e "\#$param_name#s#$current_value#$target_value#" abc.txt >> output.txtThe initial...

Generally it's "top". You may need to install it, though, which will likely require you to be root. Unix Top (http://unixtop.org/)

~ is only guaranteed to work in interactive shells (and not even then if it's the old Bourne shell as on Solaris). $HOME is the correct portable way to refer to your home directory.

Message queues don't work like file descriptors, and can't be used with select().

The usual way around this is to fork a subprocess which waits on the message queue and writes the data down a pipe...

If you're looking on Linux or one of the BSDs, I believe you'll find nice() is part of libc and is a wrapper for setpriority().

It is looking for a process whose argument list contains the string${SUNMC2OSS_PATH}/SunMC2OSS\.jar.* sunmc2oss\.SunMC2OSS\$ where the "\." sequences match literal "." characters (instead of any...

You mean this one ("REDIRECTIONS WITH NO COMMAND" in zshmisc(1))?

Otherwise, if the parameter NULLCMD is set, its value will be used as a
command with the given redirections. If...

Does the first file have a space after the ">"? If so, look at the "join" command.

Or, without using an external command:: >filename(In any Bourne-style shell but zsh, simply ">filename" will work; zsh will insert a default command (whose default value is "cat").)

That makes a big difference; "\" is treated specially by the shell. I would start by quoting all the assignments and variable expansions: a="`foo bar`"
echo "$a"

find . -ls | awk 'BEGIN {s = 0; f = ""}
$7 > s {s = $7; f = $11}
END {print f}'Assumes GNU find.

You are using the %f format to scanf, but storing to an (int). (%f requires a (double) to receive the result. GNU C with -Wformat would warn you of this mistake.)

I don't see why "expr" is there at all; and it won't understand suffixes.
$ size_dir_pass=1.2gb
$ size1=${size_dir_pass##*[0-9.]}
$ echo $size1
gb

egrep -v '^.{55} ' (assuming your columns start at 1; use {54} for 0-based)

The only way I can think of for that to happen is if $IFS is set to "/" (which is done in some shell scripts to break a path into components; it should be changed back to the default immediately...