modify file using awk

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting modify file using awk
# 1  
Old 04-18-2002
Data modify file using awk

I have a file, a.asc which is generated from a shell script:

Version: PGP 6.5.8


I want to remove the header, footer and the blank lines (---, Version etcSmilie and modify the same file. That is after I append my command in the script file, a.asc file should look like this (No blank lines):


I used awk command to identify the header, footer and blank lines.
awk '$1 ~ /(^-----)|(^Version)|(^$)/' a.asc

How do I remove these lines from a.asc so that it is modified?
Any help would be great.

# 2  
Old 04-18-2002
remember the "!" .

Regards. Hugo.
# 3  
Old 04-18-2002
Hi Hugo,

Couldnt make it work. I think I will have to use sed here.

# 4  
Old 04-18-2002
man awk --> NR

if ( NR = 4 ) {print $0}

sed also is an excelent choice.

Regards, hugo
# 5  
Old 04-18-2002
Thanks Hugo but I guess I wanted to know if I could modify the same file using these commands. In other words, I would like to delete the header and blank line from a.asc itself.
# 6  
Old 04-18-2002
Your awk command finds the lines you do not want, so if you include the negative operator that hugo_perez mentioned, then you get all but those lines:

awk '$1 !~ /(^-----)|(^Version)|(^$)/' a.asc > a.ascNEW

But cannot modify a.asc directly. You will have to rename.
# 7  
Old 04-18-2002
natty (if you have solarias) see and read the output of:

man 5 regexp
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Sed, awk or another bash command to modify string with the content of another file

Hello everybody, I would like modify some strings using sed or another command line with the content file. For example: - {fqdn: "server-01" , ip: "server-01"} - {fqdn: "server-02" , ip: "server-02"} - {fqdn: "server-03" , ip: "server-03"} - {fqdn: "server-04" , ip: "server-04"} My... (4 Replies)
Discussion started by: dco
4 Replies

2. Shell Programming and Scripting

Modify csv-files with awk

Hello everyone! I have thousands of csv files I have to import into a Database table. As usually the files aren't perfect. For example they have a different number of columns and some weird columns. The second problem is, that I have to add 3 parts of the filename into 3 rows in the... (6 Replies)
Discussion started by: elRonaldo
6 Replies

3. Shell Programming and Scripting

awk modify string

Hi Guys, i world like to do the following with awk, i have the the complete username example in a file a have some names Mario Rossi John Doe i would like to convert this name in this format from file with awk Mario,Rossi,"Mario Rossi ",,$TRUE, John,Doe,"John... (7 Replies)
Discussion started by: charli1
7 Replies

4. Shell Programming and Scripting

Modify text file using awk

I have text file with lines as shown here. Each row has 11 columns separated by tab. In each row, i want to split the 8th column such that the output should look like shown below. Here value in the 9th column is DP value and in the 10th column is MQ value followed by the values after resource.EFF=.... (15 Replies)
Discussion started by: mehar
15 Replies

5. Shell Programming and Scripting

Modify awk statement

how do i modify the following: echo "jaba law welcome no jaba law sorry now jaba law" | awk '{s+=gsub(/jaba law/,"jaba law")} END {print s}' so that it shows me the actual phrase it found matching the strings i specified? something like: jaba law jaba law jaba law (4 Replies)
Discussion started by: SkySmart
4 Replies

6. Shell Programming and Scripting

modify awk

awk "BEGIN {if($PERCENT<$WARNING) {print \"OK\" ; exit 0} else if(($PERCENT>=$WARNING) && ($PERCENT<$CRITICAL)) {print \"WARNING\" ; exit 1} else if($PERCENT>=$CRITICAL) {print \"CRITICAL\" ; exit 2} }" how can i... (1 Reply)
Discussion started by: SkySmart
1 Replies

7. Shell Programming and Scripting

Modify the file with awk,sed or perl

Hi All, I need help from any of you.Would be so thankful for your help. I/P DDDD,1045,161,1557,429,1694,800,1911,1113,2460,1457,2917> 1609,3113,1869,3317,2732,3701,3727,4132,5857,5107> 9004,6496 DDDD,1125,157,1558,429,1694,800,1911,1117,2432,1444,2906>... (2 Replies)
Discussion started by: Indra2011
2 Replies

8. Shell Programming and Scripting

Modify an XLS file with Awk

Hello, I have 2 files. One has a list of serial numbers: 12345_7 2345_9 35454 4759:1 PEP8794 The other is an excel file, with multiple columns, separated by tab: 12345_7 ... ... .. .. .. .. .. 2345_9 ... ... .. .. .. .. .. 35454 ... ... .. .. .. .. .. 4759:1 ...... (4 Replies)
Discussion started by: ad23
4 Replies

9. Shell Programming and Scripting

awk can't modify the input file ??

Hi * I've just wanted to ask you if it's possible to modify the input file by using awk. Let me explain what I need: I need to change the value $4 from "defaults" to "nodev" in my text file. I've tried to use a string function called "sub" and it works. But I can't figure it out how to... (6 Replies)
Discussion started by: martinp111
6 Replies

10. Shell Programming and Scripting

Modify shell variables with AWK

Dear Folks, I have a command output something like: And I want to store PIN0 and SIG0 in two shell variables, now I do a double awk: PIN=`gsmctl -d /dev/ttyS0 pin sig | awk '/PIN0/ { print $2}'` SIG=`gsmctl -d /dev/ttyS0 pin sig | awk '/SIG0/ { print $2}'` It's possible to... (4 Replies)
Discussion started by: Santi
4 Replies
Login or Register to Ask a Question