command.ex-2003.doc

8/7/2019 command.ex-2003.doc

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bc

Calculator.

bc cal.txt = Would result in 3, see below notes.

sqrt ( E ), length ( E ), scale ( E )

Quit : Exits the bc command.

cal

Calendar

cal - Would give you the calendar for this month.

cal 12 2000 - Would give you the calendar for December of 2000.

vi

vi myfile.txt

Edits the file myfile.txt.Esc:q!

Typing the above command would exit the vi edit done with the abovecommand.

catView a file.

Cat file1.txt. Reads file1.txt

ccC compiler.

cc myfile.c - would compile the file myfile.c.

cd

Change directory.

cd ../home/users/computerhope

cd

clear Clears screen.

cmp

Compare files.

cmp file1.txt file2.txt - Compares file1 to file2 and outputs results. Below isexample of how these results may look.

file.txt file2.txt differ: char 1011, line 112
http://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fubc.htm&sa=D&sntz=1&usg=AFQjCNEjqd3SqHy0epiq8eN15zyvoZi3xwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucal.htm&sa=D&sntz=1&usg=AFQjCNGOI9lSL2tupSRQty5AhB2UNjnQsAhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuvi.htm&sa=D&sntz=1&usg=AFQjCNE2IrKDX0CD_C4lD6ZE7q4u6WePmQhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucat.htm&sa=D&sntz=1&usg=AFQjCNF9oZplFOcEQSk-cA5sG4cWxJD27Ahttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucc.htm&sa=D&sntz=1&usg=AFQjCNGPENfLwsHnEkpHcqzZtSoRgFzeZQhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucd.htm&sa=D&sntz=1&usg=AFQjCNHJ7uW1HfdQjIF_vxuET4e7nGGrNwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuclear.htm&sa=D&sntz=1&usg=AFQjCNEthC5MGbBoUQb156Fl0XA0Nqe3zghttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucmp.htm&sa=D&sntz=1&usg=AFQjCNHLXS2o5K9darSlCp6kfUzyApphUghttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucmp.htm&sa=D&sntz=1&usg=AFQjCNHLXS2o5K9darSlCp6kfUzyApphUghttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuclear.htm&sa=D&sntz=1&usg=AFQjCNEthC5MGbBoUQb156Fl0XA0Nqe3zghttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucd.htm&sa=D&sntz=1&usg=AFQjCNHJ7uW1HfdQjIF_vxuET4e7nGGrNwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucc.htm&sa=D&sntz=1&usg=AFQjCNGPENfLwsHnEkpHcqzZtSoRgFzeZQhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucat.htm&sa=D&sntz=1&usg=AFQjCNF9oZplFOcEQSk-cA5sG4cWxJD27Ahttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuvi.htm&sa=D&sntz=1&usg=AFQjCNE2IrKDX0CD_C4lD6ZE7q4u6WePmQhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucal.htm&sa=D&sntz=1&usg=AFQjCNGOI9lSL2tupSRQty5AhB2UNjnQsAhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fubc.htm&sa=D&sntz=1&usg=AFQjCNEjqd3SqHy0epiq8eN15zyvoZi3xw


2/4

cp

Copy files.

cp file1.txt file2.txt

Copies the file1.txt in the file2.txt in current directory.

date Tells you the date and time in Unix.

echo

Displays text after echo to the terminal.

echo Hello world

The above example would return "Hello world" to the console

exit Exit from a program, shell or log you out of a Unix network.

find

Finds one or more files assuming that you know their approximate filenames.

find -name 'mypage.htm'

In the above command the system would search for any file namedmypage.htm in the current directory and any subdirectory.

grep

grep command searches the given file for lines containing a match to the given

strings or words. By default, grep prints the matching lines. Use grep to search

for lines of text that match one or many regular expressions, and outputs only

the matching lines.

grep 'word' filename

ls Lists the contents of a directory.

ls -l

In the above example this command would list each of the files in the currentdirectory and the files permissions, the size of the file, date of the lastmodification, and the file name or directory. Below is additional informationabout each of the fields this command lists.

Permissions Directories Group Size Date Directory or file

drwx------ 2 users 4096 Nov 2 19:51 mail/

drwxr-s--- 35 www 32768 Jan 20 22:39 public_html/

-rw------- 1 users 3 Nov 25 02:58 test.txt
http://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucp.htm&sa=D&sntz=1&usg=AFQjCNGy49OT8GS8WO-9jG8HaXBvOH17uQhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fudate.htm&sa=D&sntz=1&usg=AFQjCNGkzYXWrIUf_A-rQdEIR15I_7pZMAhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuecho.htm&sa=D&sntz=1&usg=AFQjCNF_BoAwLaPX5fzvTNYthoUrwHKYCwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuexit.htm&sa=D&sntz=1&usg=AFQjCNFsEDDqD95HIQ-jcRTV2Q61187aTwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fufind.htm&sa=D&sntz=1&usg=AFQjCNHrkdBepx6UYt7Viicv0KsGFJpjqghttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuls.htm&sa=D&sntz=1&usg=AFQjCNE9EwBawnBoQjaADiSh-u7dobMaVwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuls.htm&sa=D&sntz=1&usg=AFQjCNE9EwBawnBoQjaADiSh-u7dobMaVwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fufind.htm&sa=D&sntz=1&usg=AFQjCNHrkdBepx6UYt7Viicv0KsGFJpjqghttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuexit.htm&sa=D&sntz=1&usg=AFQjCNFsEDDqD95HIQ-jcRTV2Q61187aTwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuecho.htm&sa=D&sntz=1&usg=AFQjCNF_BoAwLaPX5fzvTNYthoUrwHKYCwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fudate.htm&sa=D&sntz=1&usg=AFQjCNGkzYXWrIUf_A-rQdEIR15I_7pZMAhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fucp.htm&sa=D&sntz=1&usg=AFQjCNGy49OT8GS8WO-9jG8HaXBvOH17uQ


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manDisplay a manual of a command.

man mkdir - Lists help information on the mkdir command.

mkdir

Create a directory.

mkdir mydir - This would create a new directory called mydir.

ps

Reports the process status.

Typing ps alone would list the current running processes. Below is an exampleof the output that would be generated by the ps command.

Where PID is process id, TTY is terminal that is process attach to, CMD iscommand that is running

PID TTY TIME CMD

6874 pts/9 0:00 ksh6877 pts/9 0:01 csh418 pts/9 0:00 csh

ps -ef

Display full information about each of the processes currently running.

UID PID PPID C STIME TTY TIME CMDhope 29197 18961 0 Sep27 ? 00:00:06 sshd: hope@pts/87hope 32097 29197 0 Sep27 pts/87 00:00:00 -cshhope 7209 32097 0 12:17 pts/87 00:00:00 ps -ef

ps -l

Displays processes including those that are in a wait state, similar to the belowexample.

pwd Print the current working directory.

rm

Deletes a file without confirmation (by default).

rm myfile.txt

Remove the file myfile.txt without prompting the user.

rm -r directory

Remove a directory, even if files existed in that directory.
http://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuman.htm&sa=D&sntz=1&usg=AFQjCNHZTpK0k8gPiLM0qE5cR5BXpqFMJwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fumkdir.htm&sa=D&sntz=1&usg=AFQjCNFF5YgLKyGn-3le6TNkEFO8VmceTwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fups.htm&sa=D&sntz=1&usg=AFQjCNFe4zSE_11XJT8xx7QPKdJd2gh1Fghttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fupwd.htm&sa=D&sntz=1&usg=AFQjCNFo0zwdHTywA8clmGX5Dneqiok2cQhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Furm.htm&sa=D&sntz=1&usg=AFQjCNEHpXYeWYTEDre_b6bW26w1Ep-9Mwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Furm.htm&sa=D&sntz=1&usg=AFQjCNEHpXYeWYTEDre_b6bW26w1Ep-9Mwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fupwd.htm&sa=D&sntz=1&usg=AFQjCNFo0zwdHTywA8clmGX5Dneqiok2cQhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fups.htm&sa=D&sntz=1&usg=AFQjCNFe4zSE_11XJT8xx7QPKdJd2gh1Fghttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fumkdir.htm&sa=D&sntz=1&usg=AFQjCNFF5YgLKyGn-3le6TNkEFO8VmceTwhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuman.htm&sa=D&sntz=1&usg=AFQjCNHZTpK0k8gPiLM0qE5cR5BXpqFMJw


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wc

Displays a count of lines, words, and characters in a file

wc myfile.txt

5 13 57 myfile.txt 5 = Lines,13 = Words,57 = Characters

Sort

Sort command sort the lines of a file or files, in alphabetical order. forexample if you have a file named testfile with these contents

zzzaaa1234yuerwerqwwwweThen running sort testfile will give us output of

1234aaaqwwwerwweyuerzzz
http://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuwc.htm&sa=D&sntz=1&usg=AFQjCNFDWUs-7iEd6DzJ2qE1x6u6O-inzAhttp://www.google.com/url?q=http%3A%2F%2Fwww.computerhope.com%2Funix%2Fuwc.htm&sa=D&sntz=1&usg=AFQjCNFDWUs-7iEd6DzJ2qE1x6u6O-inzA

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