Run for your life

These are some basic linux commands :

cd dir : change directory to dir
cd : change to home
pwd : show current directory
mkdir dir : create a directory dir
rm file : delete file
rm -r dir : delete directory dir
rm -f file : force remove file
rm -rf dir : force remove directory dir *
cp file1 file2 : copy file1 to file2
cp -r dir1 dir2 : copy dir1 to dir2; create dir2 if it doesn’t exist
mv file1 file2 : rename or move file1 to file2
ln -s file link : create symbolic link link to file or directory
touch file : create or update file
cat > file : places standard input into file
more file : output the contents of file
head file : output the first 10 lines of file
tail file : output the last 10 lines of file
tail -f file : output the contents of file as it grows, starting with the last 10 lines

fdisk -l : list of devices

ps : display your currently active processes
top : display all running processes
kill pid : kill process id pid
killall proc : kill all processes named proc *
bg : lists stopped or background jobs; resume a stopped job in the background
fg : brings the most recent job to foreground
fg n : brings job n to the foreground

chmod : change the permissions of file to octal

ssh user@host : connect to host as user
ssh -p port user@host : connect to host on port port as user
ssh-copy-id user@host : add your key to host for user to enable a keyed or passwordless login

grep pattern files : search for pattern in files
grep -r pattern dir : search recursively for pattern in dir
command | grep pattern : search for pattern in the output of command
locate file : find all instances of file

date : show the current date and time
cal : show this month’s calendar
uptime : show current uptime
w : display who is online
whoami : who you are logged in as
finger user : display information about user
uname -a : show kernel information
cat /proc/cpuinfo : cpu information
cat /proc/meminfo : memory information
man command – show the manual for command
df : show disk usage
du : show directory space usage
free : show memory and swap usage
whereis app : show possible locations of app
which app : show which app will be run by default

tar cf file.tar files : create a tar named file.tar containing files
tar xf file.tar : extract the files from file.tar
tar czf file.tar.gz files : create a tar with Gzip compression
tar xzf file.tar.gz : extract a tar using Gzip
tar cjf file.tar.bz2 : create a tar with Bzip2 compression
tar xjf file.tar.bz2 – extract a tar using Bzip2
gzip file : compresses file and renames it to file.gz
gzip -d file.gz : decompresses file.gz back to file

ping host : ping host and output results
whois domain : get whois information for domain
dig domain : get DNS information for domain
dig -x host : reverse lookup host
wget file : download file
wget -c file : continue a stopped download

./configure
make
make install : Install from source:
dpkg -i pkg.deb : install a package (Debian)
rpm -Uvh pkg.rpm : install a package (RPM)

Ctrl+C : halts the current command
Ctrl+Z : stops the current command, resume with fg in the foreground or bg in the background
Ctrl+D : log out of current session, similar to exit
Ctrl+W : erases one word in the current line
Ctrl+U : erases the whole line
Ctrl+R : type to bring up a recent command
!! : repeats the last command
exit : log out of current session

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This entry was posted on Thursday, September 11th, 2008 at 10:18 am and is filed under General, Linux.You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.