Menu driven ssh.

I have quite a lot of servers where I need to ssh at workplace and I generally don’t remember all of them, so I wrote a simple yet useful script. In all the servers I have already copied my key so I dont need a password to login. Without much ado, here is the script.

echo ”Enter the server name:”
echo ”1. redhat”
echo ”2. fedora”

read server

if [ ”$server” = ”1” ]; then
ssh amit@redhat
else if [ ”$server” = ”2” ]; then
ssh amit@fedora
else
echo ”Not a valid choice”
fi
fi

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Display the history and optionally grep

Ever wondered how good it would be to have a command/function that would display the history or display the history with <a class="zem_slink" title="Grep" rel="wikipedia" href="http://en.wikipedia.org/wiki/Grep">grep.

Would be really good right, well someone thought about this 🙂

$ h() { if [ -z &#8221;$1&#8221; ]; then history; else history | grep &#8221;$@&#8221;; fi; }

Place this in your .bash_profile and you can use it two different ways. If you issue &#8217;h&#8217; on its own, then it acts like the history command. If you issue:

bash script to change icon theme to check out all the installed themes (personal)

I am really annoyed with the time that is required and the number of clicks that it takes to change the gnome icon theme. So here&#8217;s a small script that I wrote to quickly check out all the icon themes that I have in my ~/.icons folder.

#!/bin/bash
[[ &#8221;$1&#8221; == &#8221;&#8221; ]] && time=5 || time=$1
[[ &#8221;$2&#8221; == &#8221;&#8221; ]] && (
cd ~/.icons
cont=&#8221;y&#8221;
echo &#8221;Select one of the icon themes&#8221;
echo &#8221;When you like some theme just press Ctrl+c&#8221;
for i in *
do
[[ -d $i/cursors ]] || (
echo &#8221;Now trying …. : $i&#8221;
gconftool-2 –type string -s  /desktop/gnome/interface/icon_theme &#8221;$i&#8221;
sleep $time
)
done
) || gconftool-2 –type string -s  /desktop/gnome/interface/icon_theme &#8221;$2&#8221;

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Get the most favourite commands from commandlinefu

For those of you who don&#8217;t know, commandlinefu should be one place you should watch to learn new things for command line. Everyday a lot of people post commands to better the previously posted commands. If you want to get the best voted commands from the archieves of commandlinefu then you can use the command:

curl -O &#8221;<a rel="nofollow" href="http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/%5B0-2400:25%5D">http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/[0-2400:25]&#8221;

Suggested by Dynetrekk ****<a href="http://www.commandlinefu.com/commands/view/2740/get-all-these-commands-in-a-text-file-with-description" target="_blank">here.

Pipe stdout and stderr, etc., to separate commands

$ some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr) You can use [n]> combined with >(cmd) to attach the various output file descriptors to be the input of different commands.

Easier Reinstalls

<span style="font-size: x-large;"><a href="http://www.howtoforge.com/easier-reinstalls">E<a href="http://www.howtoforge.com/easier-reinstalls">asier Reinstalls

Easier Reinstalls

I typically reinstall my computer operating system every six months. The reasons for this are that it cleans out the system and reinstalls require me to be in front of the computer for a total of about ten minutes so it&#8217;s painless. Notice I said &#8221;in front of the computer&#8221;, the system does all of the work for me with some specially crafted bash scripts.

coproc help - a new feature in bash

In the <a class="zem_slink freebase/en/bash" title="Bash" rel="homepage" href="http://tiswww.case.edu/php/chet/bash/bashtop.html">bash version 4.0, there is a new concept called coproc. This is very useful for some of the daily tasks.

co-<a class="zem_slink freebase/guid/9202a8c04000641f800000000005a409" title="Process (computing)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Process_%28computing%29">process starts a process in the background, optionally with a NAME, with which other processes can communicate. This can be a very <a class="zem_slink freebase/en/substitute_good" title="Substitute good" rel="wikipedia" href="http://en.wikipedia.org/wiki/Substitute_good">good substitution for <a class="zem_slink freebase/guid/9202a8c04000641f800000000048fac5" title="Pipeline (Unix)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Pipeline_%28Unix%29">pipes in lots of cases. You can learn more about coproc in the link below: