Append variable string(s) at end of each line

schaganti · 10-19-2007, 11:34 AM

Hi

Thanks in advance and appreciate any inputs.

Please see the examples for better understanding of my issue

#file1 Contents

1
2
3

#file2 COntents

1,E1,F1,G1,E2,F2,G2
2,H1,I1,J1,H2,I2,J2
3,K1,L1,M1,K2,L2,M2

create file3

cat file1.txt | grep "1" | sed 's/$/,E1,F1,G1,E2,F2,G2/'
output is
1,E1,F1,G1,E2,F2,G2 (correct)

But if I try to do it using
holder="1"
string=",E1,F1,G1,E2,F2,G2"

cat file1.txt | grep "$holder" | sed 's/$/$string/'
OUtput is:
1,$string ( NOT Correct)

Whereas I was hoping to get 1,E1,F1,G1,E2,F2,G2

Sorry for long post. Thanks for your time

spirit receiver · 10-19-2007, 01:18 PM

Variables don't get expanded in single quotes. You can use double quotes instead, but then you should escape the '$' that should not be modified:

Code:

ada@barnabas:~> string="lala"
ada@barnabas:~> echo '\$string $string'
\$string $string
ada@barnabas:~> echo "\$string $string"
$string lala
ada@barnabas:~> echo -e "line 1\nline 2\nline 3" | sed -e "/^line 2/{s/$/ $string/}"
line 1
line 2 lala
line 3
ada@barnabas:~>

schaganti · 10-19-2007, 01:31 PM

Thanks a lot. That works great.