You don't need an else block. And you don't need to fail if you receive more than one argument. You only need to fail if you don't get an argument and you can then just ignore everything else or quit if you don't get at least the one.
set -- "${1?ERR: Where\'s my argument?!?!}"
That statement ...
Use
tac 'big_file' | grep "expression"
From man tac:
Description
Write each FILE to standard output, last line first. With no FILE, or when FILE is -, read standard input.
I'm running Ubuntu 14.04 Trusty Tahr in a Microsoft Hyper-V virtual machine on Windows Server 2012 R2. I've stopped the VM, replaced an EXT4-formatted virtual disk volume (/dev/sdb) with a new (unformatted) disk volume and restarted the VM. I see the following messages:
Filesystem check or mou...
I want to have server b to have exactly the same setup as server a.
My plan is to have a list of all installed things on server a and install it by using the list on server b something like :
yum -y install $(cat installed.txt)
In server a, should I rather use:
rpm -qa > installed.txt
or...
I've encountered two incidents where commands (or logic flow) is given forward and backwards
In bash scripts:
if ... fi (use to closed an if-statement)
and in GNU/Linux command line:
cat; tac (cat prints a file to stdout and tac prints the file in reverse order)
As a piece of trivial informati...
As Stack Exchange continues to expand to serve new audiences, we’re constantly on the lookout for folks who can take the principles and practices we all hold dear and communicate them effectively to the folks who would otherwise find them strange and difficult. I’m happy to announce we’ve found another of these rare specimens in the form of Joshua Maciel:
Josh joins us remotely from beautiful Kansai Japan, where youthful ignorance brought him for a two-year stay (maximum!) to teach English. Eleven years later he still hasn’t left, having found gainful employment doing internat …
Let me start by saying I know this was dumb. Time and Linux make fools of us all.
I made an echo command to my .bash_aliases file and erased all of my aliases, except the test alias. However, I still have a session open that has the aliases loaded (into the tcl?). Can I retrieve them from thi...
