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How to insert string at particular 4th line in text file


 
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# 1  
Old 08-05-2009
How to insert string at particular 4th line in text file

I just want to add a particular string in text file using shell script

text file format

1 columns-10
2 text=89
3 no<>
4
5 test-9876
6 size=9

string need to insert in 4th line
<switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>

After inserting the output of file looks like

1 columns-10
2 text=89
3 no<>
4 <switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>
5 test-9876
6 size=9

Please suggest..
# 2  
Old 08-05-2009
To keep the forums high quality for all users, please take the time to format your posts correctly.

First of all, use Code Tags when you post any code or data samples so others can easily read your code. You can easily do this by highlighting your code and then clicking on the # in the editing menu. (You can also type code tags [code] and [/code] by hand.)

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Third, be careful when you cut-and-paste, edit any odd characters and make sure all links are working property.

Thank You.

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****************************************************

Code:
$> STRING="<switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>"
$> awk -v string="${STRING}" 'NR == 4 {print string} $0' infile
columns-10
text=89
no<>
<switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>
test-9876
size=9


Last edited by zaxxon; 08-05-2009 at 09:50 AM.. Reason: slight modification, the single quotes were gone
# 3  
Old 08-05-2009
Code:
awk '
NR == 4 { $0="<switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>" 
            }
            { print $0 }  
' textfile

# 4  
Old 08-05-2009
@kshji
This way the single quotes ' are gone. Had the same problem in my pre-edited solution.
# 5  
Old 08-05-2009
It's still not working.. As there already a blank line in 4th position

Error I am getting : awk: can't set $0
record number 4
# 6  
Old 08-05-2009
Which solution did you try out? I edited mine meanwhile.
# 7  
Old 08-05-2009
Straight forward I am executing the below scripts but it is generating the below error

STRING="<switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>"

awk -v string="${STRING}" 'NR == 4 {print string} $0' test_file


awk: syntax error near line 1
awk: bailing out near line 1

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