Using Sed to read one line only


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Using Sed to read one line only
# 1  
Old 10-30-2008
Using Sed to read one line only

I have a bash script which produces the desired output (mostly).

Code:
tempTxt=`sed -n '79,/^$/p' <sourceFile.txt | cut -c 13-19`

What this produces is the text from the 79th line of the source file and cuts the text to the 13th through the 19th chars.

Then the script does the same thing for the two lines in the source file following the 79th. In essence the script pulls the text from lines 79-81, when what I want is only the 79th line. The line begins with the pattern $ ( dollar sign) in the text string.

I have seen many examples on how to give sed a range of lines, but how do I tell it to stop once the line in question is complete?

Thanks in advance.
# 2  
Old 10-30-2008
If awk is allowed:

Code:
awk 'NR==79{print substr($0, 13, 7);exit}' sourceFile.txt

# 3  
Old 10-30-2008
Your question is somewhat unclear. If you want just the 79th line then use
Code:
tempTxt=`sed -n '79p' <sourceFile.txt | cut -c 13-19`

# 4  
Old 10-30-2008
Quote:
Originally Posted by fpmurphy
Your question is somewhat unclear. If you want just the 79th line then use
Code:
tempTxt=`sed -n '79p' <sourceFile.txt | cut -c 13-19`

I will try this and repost the output
# 5  
Old 10-30-2008
Code:
tempTxt=`sed -n '79p' <sourceFile.txt | cut -c 13-19`

worked really well
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

With script bash, read file line per line starting at the end

Hello, I'm works on Ubuntu server My goal : I would like to read file line per line, but i want to started at the end of file. Currently, I use instructions : while read line; do COMMAND done < /var/log/apache2/access.log But, the first line, i don't want this. The file is long... (5 Replies)
Discussion started by: Fuziion
5 Replies

2. Shell Programming and Scripting

[BASH] read 'line' issue with leading tabs and virtual line breaks

Heyas I'm trying to read/display a file its content and put borders around it (tui-cat / tui-cat -t(ypwriter). The typewriter-part is a 'bonus' but still has its own flaws, but thats for later. So in some way, i'm trying to rewrite cat using bash and other commands. But sadly it fails on... (2 Replies)
Discussion started by: sea
2 Replies

3. Shell Programming and Scripting

How to read file line by line and compare subset of 1st line with 2nd?

Hi all, I have a log file say Test.log that gets updated continuously and it has data in pipe separated format. A sample log file would look like: <date1>|<data1>|<url1>|<result1> <date2>|<data2>|<url2>|<result2> <date3>|<data3>|<url3>|<result3> <date4>|<data4>|<url4>|<result4> What I... (3 Replies)
Discussion started by: pat_pramod
3 Replies

4. Shell Programming and Scripting

Bash script to read a file from particular line till required line and process

Hi All, Am trying to write wrapper shell/bash script on a utility tool for which i need to pass 2 files as arugment to execute utility tool. Wraper script am trying is to do with above metion 2 files. utility tool accepts : a. userinfo file : which contains username b. item file : which... (2 Replies)
Discussion started by: Optimus81
2 Replies

5. Shell Programming and Scripting

Need a program that read a file line by line and prints out lines 1, 2 & 3 after an empty line...

Hello, I need a program that read a file line by line and prints out lines 1, 2 & 3 after an empty line... An example of entries in the file would be: SRVXPAPI001 ERRO JUN24 07:28:34 1775 REASON= 0000, PROCID= #E506 #1065: TPCIPPR, INDEX= 003F ... (8 Replies)
Discussion started by: Ferocci
8 Replies

6. Shell Programming and Scripting

how to read the contents of two files line by line and compare the line by line?

Hi All, I'm trying to figure out which are the trusted-ips and which are not using a script file.. I have a file named 'ip-list.txt' which contains some ip addresses and another file named 'trusted-ip-list.txt' which also contains some ip addresses. I want to read a line from... (4 Replies)
Discussion started by: mjavalkar
4 Replies

7. Shell Programming and Scripting

Shell script to read a text file line by line & process it...

Hi , I am trying to write an shell, which reads a text file (from a location) having a list of numbers of strictly 5 digits only ex: 33144 Now my script will check : 1) that each entry is only 5 digits & numeric only, no alphabets, & its not empty. 2)then it executes a shell script called... (8 Replies)
Discussion started by: new_to_shell
8 Replies

8. Shell Programming and Scripting

sed to read line by line and input into another file

I have two files. Fileone contains text string one text string two text string three Filetwo contains Name: Address: Summary: Name: Address: Summary: Name: Address: Summary: I would like to use sed to read each line of file one and put it at the end of the summary line of file... (3 Replies)
Discussion started by: dolacap
3 Replies

9. Shell Programming and Scripting

bash: read file line by line (lines have '\0') - not full line has read???

I am using the while-loop to read a file. The file has lines with null-terminated strings (words, actually.) What I have by that reading - just a first word up to '\0'! I need to have whole string up to 'new line' - (LF, 10#10, 16#A) What I am doing wrong? #make file 'grb' with... (6 Replies)
Discussion started by: alex_5161
6 Replies

10. Shell Programming and Scripting

Read logline line by line with awk/sed

Hello, I have a logfile which is in this format: 1211667249500#3265 1211667266687#2875 1211667270781#1828 Is there a way to read the logfile line by line every time I execute the code and put the two numbers in the line in two separate variables? Something like: 1211667249500#3265... (7 Replies)
Discussion started by: dejavu88
7 Replies
Login or Register to Ask a Question