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Linux Bash Commands

QuestionAnswer
ls directory listing
ls -al formatted listing with hidden files
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 if file2 is an existing directory, moves file1 into directory file2
ln -s file link create symbolic link link to file
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 Process Management
ps display your currently active processes
top display all running processes
chmod octal file change the permissions of fileto octal, which can be found separately for user,group, and world by adding:● 4 – read (r)● 2 – write (w)● 1 – execute (x)Examples:chmod 777 – read, write, execute for allchmod 755 – rwx for owner, rx for group and world
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
whoami who you are logged in as
man command show the manual for command
gzip file compresses file and renames it to file.gz
gzip -d file.gz decompresses file.gz back to file
!! - repeats the last command repeats the last command
exit log out of current session
Created by: louieb39