Read File Names from ls -l

Command to print file names from ls -l output:

ls -l | while read a b c d e f g h i ; do echo $i; done

GDB handy commands

Multi-threaded

info threads

Signals

info signals
// To pass the signal from GDB to the process.
handle SIGINT pass

To Debug a running process using GDB

gdb

timeout

Debian has an interesting command timeout:

timeout 5 tail -f /var/log/messages

If you do not have timeout package installed, perl can be used to perform the same:

perl -e "alarm shift @ARGV; exec @ARGV;" 5 tail -f /var/log/messages

Reference links:
http://michael.thegrebs.com/2008/05/27/most-awesome-command-ever/
http://www.cyberciti.biz/faq/shell-scripting-run-command-under-alarmclock/

Get the last column from the ls command

awk '{ printf $NF;$NF = "" ;printf " "$0"\n" }' | sort

http://www.linuxfocus.org/English/September1999/article103.html

Here is one more trick I have learned from my colleague

ls -ltr | while read a b c d e f g h file; do echo $file; done

The second technique looks much easy to me

xargs command replace string

Using xargs command with replace string

to scp files with spec pattern

ls file* | xargs -n1 -i{} scp {} root@:/dest

Screen Command

Unix Screen command is an indespensable command. Once you know it you cannot live without it. It is window manager. Just try it and you will find it mind blowing.

A new screen can be created using
screen.

Ctrl-A c - Create new window
Ctrl-A A - Name a window
Ctrl-A " - Show all windows.

Ctrl-A S split window.
Ctrl-A tab to move to the next window.

UNIX: Passwordless authentication

You can have passwordless authentication using the information in the given site

http://www.unixwiz.net/techtips/putty-openssh.html

UNIX: watch command

Watch command is pretty helpful if you want to continuously view the output of a command.
example:

watch --interval=10 mpstat

This shows the output of mpstat command every 10 secs in a window.