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Unix/Linux Command Reference

ls – directory listing
date – show the current date and time
ls -al – formatted listing with hidden files
cal – show this month's calendar
cd dir - change directory to dir
uptime – show current uptime
cd – change to home
w – display who is online
pwd – show current directory
whoami – who you are logged in as
mkdir dir – create a directory dir
finger user – display information about user
rm file – delete file
uname -a – show kernel information
rm -r dir – delete directory dir
cat /proc/cpuinfo – cpu information
rm -f file – force remove file
cat /proc/meminfo – memory information
rm -rf dir – force remove dirFile System Infoectory dir *
man command – show the mFile Commands System Infoanual for command
cp file1 file2 – copy file1 to file2
df – show disk usage
cp -r dir1 dir2 – copy dir1 to dir2; create dir2 if it du – show directory space usage doesn't exist
free – show memory and swap usage
mv file1 file2 – rename or move file1 to file2
whereis app – show possible locations of app if file2 is an existing directory, moves file1 into
which app – show which app will be run by default directory file2
Compression
ln -s file link – create symbolic link link to file
tar cf file.tar files – create a tar named
touch file – create or update file file.tar containing files
cat > file – places standard input into file
tar xf file.tar – extract the files from file.tar
more file – output the contents of file
tar czf file.tar.gz files – create a tar with
head file – output the first 10 lines of file Gzip compression
tail file – output the last 10 lines of file
tar xzf file.tar.gz – extract a tar using Gzip
tail -f file – output the contents of file as it
tar cjf file.tar.bz2 – create a tar with Bzip2 grows, starting with the last 10 lines
compression

tar xjf file.tar.bz2 – extract a tar using Bzip2
ps – display your currently active processes
gzip file – compresses file and renames it to
top – display all running processes file.gz
kill pid – kill process id pid
gzip -d file.gz – decompresses file.gz back to
killall proc – kill all processes named proc *
bg – lists stopped or background jobs; resume a
stopped job in the background
Network
fg – brings the most recent job to foreground
ping host – ping host and output results
fg n – brings job n to the foreground
whois domain – get whois information for domain
dig domain – get DNS information for domain
File Permissions
dig -x host – reverse lookup host
chmod octal file – change the permissions of file
wget file – download file
to octal, which can be found separately for user,
wget -c file – continue a stopped download
group, and world by adding:
     ● 4 – read (r)
Installation
     ● 2 – write (w)
Install from source:
     ● 1 – execute (x)
./configure
Examples:
make
chmod 777 – read, write, execute for all
make install
chmod 755 – rwx for owner, rx for group and world
dpkg -i pkg.deb – install a package (Debian)
For more options, see man chmod.
rpm -Uvh pkg.rpm – install a package (RPM)
SSH
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
Searching
Shortcuts
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
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

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