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See the man page for test.

if [ -s $file_name ]; then
echo Yay
else
echo Boo
fi

That will Yay if the file exists, and has a size greater than zero, and Boo if the file does not exist, or...

If you're using newer versions of GNU sed:sed -i 's/2006/2007/g' file

Your $DISPLAY variable is not getting set for some reason.

If you specify . ./file.ksh, it's like running the contents of that file in your current shell. It's a bit smarter than this, but think of it running:
while read line; do "$line"; done <file.ksh...

My first guess would be:

#! /bin/bash

logfile=/path/to/logfile
while read ip; do
zgrep "$ip" $logfile > output_logfile_${ip}
done <iplist


It could be done more elegantly, and maybe...

What is your input filename and expected output filename set?

As a proof of concept, assume I put your example in "tmp.in" and ran this script:

#! /bin/bash

declare i=1
while read line; do ...

This works in bash:

echo ${PWD##*/}


[Edit: Derp - I somehow missed everyone else's replies. Sorry for the repeat.]

I'd buy Bill Joy a beer for vi, but punch him halfway through the round for NFS and csh.

I guess we shouldn't blame him completely, though. NFS and csh were good for their time - it's those lousy...

Here's my crack at it, although if you're working with huge files, it might not be a great idea to load that much into the Hold buffer:

sed -n '1h;2,$H;${g;s/\n/\t/g;s/\tReceiver/\nReceiver/g;p}'...

It depends on your shell. Which shell are you using?

Assuming from the syntax that it's sh, bash, ksh, or similar, check for a .profile, .bashrc, or .bash_profile in your home directory -...

It has to do with how your shell expands the command.

Try this, assuming you're in the same directory as the file:

# mv ./-X ./dash-X


Then you can examine or remove the 'dash-X' file.

What about using "ed", or "ex"?
Say, you had a list of files and directories in a text file named tmp.list.
If you wanted to get rid of all items matching "Desktop" (the same as using "grep -v...

Well, grep is certainly the best way to search through a file... combined with options that allow you to only display the name of the files that contain the search string, it'd be hard to duplicate....