UNIX COMMANDS CHEAT SHEET Command Example ... | Study notes History

U N IX C O M M A N D S CHEAT SHEE T

Command

Example

Description

1. ls

ls -alF

Lists files in current directory

List in long format

2. cd

cd tempdir

cd ..

cd ~dhyatt/web-docs

Change directory to tempdir

Move back one directory

Move into dhyatt's web-docs directory

3. mkdir

mkdir graphics

Make a directory called graphics

4. cp

cp file1 web-docs

cp file1 file1.bak

Copy file into directory

Make backup of file1

5. rm

rm file1.bak

Remove or delete file

6. mv

mv old.html new.html

Move or rename files

7. man

man ls

Online manual (help) about command

8. head

head file1

head -100 file1

Display the first 10 lines in a file

Display the first 100 lines in a file

9. tail

tail file1

tail –f file1

Display the last 10 lines in a file

Display the contents of the file as it

grows, last 10 lines at a time.

10. less

more index.html

Look at file, one page at a time

11. more

less index.html

Look at file, one page at a time

12. cat

cat index.html

cat file1 file2

Print on the standard output

Concatenate files

13. grep <str><files>

grep "bad word" file1

Look for occurrence of a certain pattern

in a file

14. chmod <opt> <file>

chmod 644 *.html

chmod 755 file.exe

Change file permissions read only

Change file permissions to executable

15. ps <opt>

ps aux

ps aux | grep dhyatt

List all running processes by #ID

List process #ID's running by dhyatt

16. kill <opt> <ID>

kill -9 8453

Kill process with ID #8453

17. history

history

Lists commands you've done recently

18. top

top

Print system usage and top resource

hogs

19. pwd

pwd

Print name of current/working directory

20. gzip <file>

gzip bigfile

gunzip bigfile.gz

Compress file

Uncompress file

21. tar <file>

tar -cf subdir.tar subdir

tar -xvf subdir.tar

Create an archive called subdir.tar of a

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UNIX COMMANDS CHEAT SHEET

Command Example Description

ls ls ls - alF Lists files in current directory List in long format
cd cd tempdir cd .. cd ~dhyatt/web-docs Change directory to tempdir Move back one directory Move into dhyatt's web-docs directory
mkdir mkdir graphics Make a directory called graphics
cp cp file1 web-docs cp file1 file1.bak Copy file into directory Make backup of file
rm rm file1.bak Remove or delete file
mv mv old.html new.html Move or rename files
man man ls Online manual (help) about command
head head file head - 100 file Display the first 10 lines in a file Display the first 100 lines in a file
tail tail file tail – f file Display the last 10 lines in a file Display the contents of the file as it grows, last 10 lines at a time.
less more index.html Look at file, one page at a time
more less index.html Look at file, one page at a time
cat cat index.html cat file1 file Print on the standard output Concatenate files
**grep ** grep "bad word" file1 Look for occurrence of a certain pattern in a file
**chmod ** chmod 644 *.html chmod 755 file.exe Change file permissions read only Change file permissions to executable
**ps ** ps aux ps aux | grep dhyatt List all running processes by #ID List process #ID's running by dhyatt
**kill ** kill - 9 8453 Kill process with ID #
history history Lists commands you've done recently
top (^) top Print system usage and top resource hogs
pwd (^) pwd Print name of current/working directory
gzip ** gzip bigfile gunzip bigfile.gz Compress file Uncompress file 21. tar ** tar - cf subdir.tar subdir tar - xvf subdir.tar Create an archive called subdir.tar of a directory Extract files from an archive file
ln – s link ln – s file link Create symbolic link, link to file
df df – h Show disk space in human-readable format
du du Show directory space usage 25**. nohup ** nohup cp file1 file2 Run a command immune to hang-ups,
** &** nohup cp file1 file2 & Run a command in the background
ssh ** ssh [email protected] Connect to host as user 28. wget ** wget http://seq.edu/file Download file from valid url
scp scp [email protected]:file [email protected]:file Secure copy a file from one host to another Collected from http://www.tjhsst.edu/~dhyatt/superap/unixcmd.html

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UNIX COMMANDS CHEAT SHEET

Command Example Description