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Shell Programming and Scripting

How to remove last comma?

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# 8  
Old 10-29-2013
Code:
sed "s/.*/'&'/" | paste -sd, -

Regards,
Alister
These 2 Users Gave Thanks to alister For This Post:
ken6503 Scrutinizer
# 9  
Old 01-21-2014
Following may also one of the solutions.

Input file is.

Code:
a
b
c
d


Code:
paste -d"," - - - - < file_name | awk -vs1="\'" '{for(i=1;i<=NF;i++) {if(i==4) {ORS=""; print s1 $i s1} if(i!=4) {print s1 $i s1}}}' FS=, ORS=","


Output will be as follows.


Code:
'a','b','c','d'

Thanks,
R. Singh
# 10  
Old 01-21-2014
Manual longhand using bash builtins, OSX.10.7.5...
Code:
Last login: Tue Jan 21 21:14:03 on ttys000
AMIGA:barrywalker~> text="'a','b','c','d',"
AMIGA:barrywalker~> echo "$text"
'a','b','c','d',
AMIGA:barrywalker~> text="${text:0:$[ ( ${#text} - 1 ) ]}"
AMIGA:barrywalker~> echo "$text"
'a','b','c','d'
AMIGA:barrywalker~> _

EDIT: Add the code below to simulate a file.
Code:
Last login: Tue Jan 21 21:16:30 on ttys000
AMIGA:barrywalker~> echo -n "'a','b','c','d'," > /tmp/txt
AMIGA:barrywalker~> read text < /tmp/txt
AMIGA:barrywalker~> echo "$text"
'a','b','c','d',
AMIGA:barrywalker~> text="${text:0:$[ ( ${#text} - 1 ) ]}"
AMIGA:barrywalker~> echo "$text"
'a','b','c','d'
AMIGA:barrywalker~> echo -n "$text" > /tmp/txt
AMIGA:barrywalker~> read text < /tmp/txt
AMIGA:barrywalker~> echo "$text"
'a','b','c','d'
AMIGA:barrywalker~> _

Last edited by wisecracker; 01-21-2014 at 05:33 PM.. Reason: See above.
# 11  
Old 01-22-2014
Trying to keep is neat yet readable, if its in a file, you could:-
Code:
while read line
do
   var="${var}'${line}',"
done < file

var="${var%,}"


If you prefer to build the big string another way, you can still use the last line to trim off the trailing comma if you are using ksh or bash


I hope that this helps,

Robin
Liverpool/Blackburn
UK
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