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

Shell Programming and Scripting
1

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

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

$> 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
3 
awk '
NR == 4 { $0="<switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>" 
            }
            { print $0 }  
' textfile
4

@kshji
This way the single quotes ' are gone. Had the same problem in my pre-edited solution.

5

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

Which solution did you try out? I edited mine meanwhile.

7

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

8

. Life is learning process. Awk has ... method to handle " '. zaxxon has solution for that.

awk -v line4="<switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>" '
NR == 4 {
             print line4 ; next
            }
            { print $0 }
' infile

Or

awk -v line4="<switch IP='158.195.2.567' port='5900' user='testc' password='asdfrp' Code='8'>" '
NR == 4 {
             $0=line4
            }
            { print $0 }
' infile

Works fine. Tested.

9

You awk may not support -v option
try nawk,gawk