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Shell Programming and Scripting

Text formatting

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# 1  
Old 12-02-2010
Bug Text formatting
I have an input file as below.

1
Sanjib
Gayen
2
Chetan
Jadhav
3
Vijaykumar
Uddi
4
Pinaki
Sarkar


I want to generate an output file as below.

1-Sanjib Gayen
2-Chetan Jadhav
3-Vijaykumar Uddi
4-Pinaki Sarkar


I have achieved this using Recording in Vi Editor. But I want this to be done on command prompt. I tried sed command as well, but couldn't make it. So, your suggestions required!!!!!Smilie
R0H0N
# 2  
Old 12-02-2010
Code:
$ xargs -n3 < infile
1 Sanjib Gayen
2 Chetan Jadhav
3 Vijaykumar Uddi
4 Pinaki Sarkar

Code:
$ xargs -n3 < infile | sed 's/ /-/'
1-Sanjib Gayen
2-Chetan Jadhav
3-Vijaykumar Uddi
4-Pinaki Sarkar

This User Gave Thanks to Scrutinizer For This Post:
# 3  
Old 12-02-2010
Code:
awk '{ORS=NR%3==1?"-":NR%3==2?FS:RS}1' file

# 4  
Old 12-02-2010
please explain this command, as I didn't understand
R0H0N
# 5  
Old 12-02-2010
Quote:
Originally Posted by R0H0N
please explain this command, as I didn't understand
Code:
awk '{ORS=NR%3==1?"-":NR%3==2?FS:RS}1' file

To determine the ORS (output record separator) we use a modulo and a conditional operator.
Code:
ORS=NR%3==1?"-" 	If NR%3==1 ORS="-"
:NR%3==2?FS:RS  	...else if NR%3==2 ORS=FS else ORS=RS

If these stuff is new to you can have read of:

Awk tutorial:

Awk - A Tutorial and Introduction - by Bruce Barnett

Modulo operator:

Modulo operation - Wikipedia, the free encyclopedia

Conditional operator:

?: - Wikipedia, the free encyclopedia
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