If you are using linux server then most of the time you would be using command line interface for interacting with your server or installing, updating your server applications.
As a linux server admin you should know following commands :
cd - : Go to previous directory
cd : Go to $HOME
pushd . Put current dir on stack so you can popd back to it
which : Show full path name of command
time : See how long a command takes
time cat : Start stopwatch. Ctrl-d to stop.
ls -lrt : List files by date.
find -type f -print0 | xargs -r0 grep -F ‘test’ : Will search all regular files for ‘test’in this dir and below
find -maxdepth 1 -type f | xargs grep -F ‘test’ : Search all regular files for ‘test’ in this dir.
find -type d ! -perm -111 : You will get output as dirs which are not accessible by all
gpg -c : Use to Encrypt a file
gpg file.gpg : Use to Decrypt a file
tar -c dir/ | bzip2 > dir.tar.bz2 : Using this command you can compress archive of dir/
wget -r -nd -np -l1 -A ‘*.jpg’ http://wwwDOTexampleDOTcom/dir/ : Using this command you can download a set of files at current directory.
echo ‘wget url’ | at 01:00 : If you need to download certain file from a url say at 1AM to your current dir then you can use this command.
wget -nv –spider –force-html -i bookmarks.html : Check links in a file ethtool eth0 : Show status of ethernet interface eth0
ip link set dev eth0 up : You can bring interface eth0 up (or down)
ip route show : this command will list routing table
ip route add default via 1.2.3.254 : If you need to set default gateway for 1.2.3.254 then use this command with preferred gateway number.
hostname -i : Lookup local ip address
netstat -tup : this command will list all active connections to/from your system.
sed ’s/string1/string2/g’ : If you need to replace string1 with string2 then use this command.
sed -n ‘1000p;1000q‘ : this command will print 1000th line.
history | wc -l : command will count lines
cal 9 1752 : if you need to read calendar for a particular date use this command it will display a calendar for a particular month year.
gzip < /dev/cdrom > cdrom.iso.gz : if you need to save copy of data from cdrom then use this command.
cdrecord -v dev=/dev/cdrom -audio *.wav : if you want to make a audio CD from all wave in current dir
ls -lSr : Show files by size, you will get file with smallest file size at the top.
uname -a : it will display kernel version and system architecture
grep “model name” /proc/cpuinfo : this command will display information of your CPU.
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This post was written by admin on September 15, 2008
