What do you know about the Sed and Awk command??

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers What do you know about the Sed and Awk command??
# 1  
Old 01-25-2002
What do you know about the Sed and Awk command??

I just need some information on what they can be use for and whatever else there is.

anything you know, state here
# 2  
Old 01-25-2002
why not do man sed or man awk
They should give you all the basics.

sed is a stream editor, lets you edit a file without actually going into the file in an editor like vi. Say you have a form letter and you need to change the greeting from "Dear Sir" to "Dear Madam". The command would be
sed 's/Dear Sir/Dear Madam/g' form-letter > new-form-letter
broken down
s = substitute
Dear Sir = the string you want to locate and replace
Dear Madam = the string you want to put in place of Dear Sir
g = global option = will change all instances of Dear Sir to Dear Madam
form-letter = the name of the file containing the stuff you want to change
new-form-letter = the name of the new file that will contain the changes

awk lets you locate particular records and fields in a database, and change them, display them, whatever.

day you have a data file of names and addresses, contacts:
01 Joe FirstSt
02 John SecondSt
03 Bill ThirdSt
04 Joe Fourthst

if you wanted to print only the records that contain the name Joe, you could
awk '/Joe/ {print $2}' contacts

/Joe/ = tells awk to find lines that contain the string Joe
{print $2} = tells awk to output the second field of the selected lines
contacts = the name of the data file you are searching

In both the sed and awk utilities, you need the apostrophes to pass the parameters to the utilities without the shell trying to interpret them.

check the man pages for more abilities and options
I'm a newbie too, so if I left something out, someone correct me!
# 3  
Old 01-25-2002
Sed maybe right

from what I have learnt from the book I read Sed is something along these lines...I maybe wrong...from what I have read in here everyone I envy for there knowledge....Sed


If you have a file like

don Migus 12 heart st california
and the file is called addresses

if you wanted to change the D's to j's you would write

sed '/d/j/' addresses....

I am not sure if this is correct as I dont have the book in front of me..and If I am wrong somebody please tell me and put in the write input....

But I am just trying
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Help with sed/awk command

Hi All, This is my first thread. Hopefully you guys can help me out. I have a csv file, that provides access to managers to a tool. The file is loaded onto our server containing all the assc id's with a trailing comma. For ex: 182950, 123456, However, we receive a file that... (8 Replies)
Discussion started by: Prateek Dubey
8 Replies

2. Shell Programming and Scripting

Need help with sed/awk command

Dear all, I have a file named as fileName with following entities, functions { planeDictName { type surfaces; functionObjectLibs ( "libsampling.so" ); outputControl timeStep; surfaceFormat vtk; fields ( p U ); ... (42 Replies)
Discussion started by: linuxUser_
42 Replies

3. Shell Programming and Scripting

Need help with sed/awk command

Dear ALL, I am still struggling with some basic sed operations. I want to change path in a file as shown below: case_OM = PV4Reader( FileName='/home/linuxUser/demoCases/s1/case/case.OM' ) to case_OM = PV4Reader( FileName='/home/linuxUser/demoCases/s2/case/case.OM' ) In this file there... (5 Replies)
Discussion started by: linuxUser_
5 Replies

4. Shell Programming and Scripting

sed and awk giving error ./sample.sh: line 13: sed: command not found

Hi, I am running a script sample.sh in bash environment .In the script i am using sed and awk commands which when executed individually from terminal they are getting executed normally but when i give these sed and awk commands in the script it is giving the below errors :- ./sample.sh: line... (12 Replies)
Discussion started by: satishmallidi
12 Replies

5. Shell Programming and Scripting

Command line - awk, sed

My input file gfile values is CTRY=GM&PROJTYPE=SP&PROJECTTYPE=Small+Project If i am giving PROJECTTYPE then it must give Small Project awk -F"&" '{for (i=1; i<=NF; i++) if ($i ~ "^"PAT) {sub ("^"PAT"=", "", $i); sed 's/'+'/""/' $i ; print $i }}' PAT=$1 ... (6 Replies)
Discussion started by: nag_sathi
6 Replies

6. Shell Programming and Scripting

SED/AWK command

Hi All, I have a file which has following lines : - Deploy XXX application <server-address> - info <server-address> - Deploy XXX application <server-address> - info <server-address> - Deploy XXX application <server-address> - info <server-address> I want output like this way in... (8 Replies)
Discussion started by: bhaskar_m
8 Replies

7. Shell Programming and Scripting

Interpret sed and awk in the below command.

Could you interpret the following sed and awk command for me? command: cat tempfile2 |sed "s/\(BUILD-3-.*-\.-\)\(.*\..*\..*\)/\2/" | awk '{printf "%-8.8s %-23.23s %-30.30s %-50.50s\n", $1,$2,$3,substr($0,index($0,$4))}' > outfile2 2>/dev/null input:data in tempfile2... (5 Replies)
Discussion started by: vj8436
5 Replies

8. Shell Programming and Scripting

awk/sed Command : Parse parameter file / send the lines to the ksh export command

Sorry for the duplicate thread this one is similar to the one in https://www.unix.com/shell-programming-scripting/88132-awk-sed-script-read-values-parameter-files.html#post302255121 Since there were no responses on the parent thread since it got resolved partially i thought to open the new... (4 Replies)
Discussion started by: rajan_san
4 Replies

9. Shell Programming and Scripting

sed for this awk command

Hi what would be the sed equivalent of this awk command: awk '/$getsn/{getline;next}{print}' file It deletes the variable found and the next line after it in a file. Thanks (3 Replies)
Discussion started by: wisher115
3 Replies

10. Shell Programming and Scripting

Help with Sed or AWK command!!!

Hi, I need help with Sed or AWk command.i want to remove all the numerals from the file name.These files are stored within a text file and after the numerals are removed,i need to redirect its output to another new .txt file. Input: aa_1002985_952.xml aa_bb_032207.txt... (5 Replies)
Discussion started by: kumarsaravana_s
5 Replies
Login or Register to Ask a Question