Need to add a numeric & special char to end of the first line Post: 302985593

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Top Forums Shell Programming and Scripting Need to add a numeric & special char to end of the first line Post 302985593 by RavinderSingh13 on Saturday 12th of November 2016 08:50:57 AM

11-12-2016

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Quote:

Originally Posted by Joselouis

Need to add a numeric & special char to end of the first line
Existing file:

Code:

12-11-16|11 2016 Jan 12:34:55|03:55|
13-10-16|10 2016 Jan 12:34:55|03:55|12-11-16|11 2016 Jan 12:34:55|03:55|
14-10-16|19 2016 Jan 12:34:55|03:55|13-11-16|11 2016 Jan 12:34:55|04:55|
15-10-16|18 2016 Jan 12:34:55|03:55|14-11-16|11 2016 Jan 12:34:55|05:55|
16-10-16|17 2016 Jan 12:34:55|03:55|15-11-16|11 2016 Jan 12:34:55|06:55|
17-10-16|16 2016 Jan 12:34:55|03:55|16-11-16|11 2016 Jan 12:34:55|07:55|

I have used the below command to perform that, but it is working only for string

Code:

VAR="12-11-16|11 2016 Jan 12:34:55|03:55|"
sed -i '1s/$/"$VAR"/' file

when am using this for above $VAR which has special char in it, it is failing, is there a way to do this in awk or in sed without redirecting to another file?

Hello Joselouis,

Welcome to forums, hope you will enjoy learning and sharing knowledge and learning here. Could you please try following as a starting point and let me know if this helps you.

Code:

sed -i '1s/^/'"$s1"'/;1s/$/'"$s1"'/'  Input_file

Where variable named s1have the value of " and it will provide the output as follows.

Code:

sed -i '1s/^/'"$s1"'/;1s/$/'"$s1"'/'  Input_file

Output will be as follows.

Code:

"12-11-16|11 2016 Jan 12:34:55|03:55|12-11-16|11 2016 Jan 12:34:55|03:55|"
13-10-16|10 2016 Jan 12:34:55|03:55|12-11-16|11 2016 Jan 12:34:55|03:55|
14-10-16|19 2016 Jan 12:34:55|03:55|13-11-16|11 2016 Jan 12:34:55|04:55|
15-10-16|18 2016 Jan 12:34:55|03:55|14-11-16|11 2016 Jan 12:34:55|05:55|
16-10-16|17 2016 Jan 12:34:55|03:55|15-11-16|11 2016 Jan 12:34:55|06:55|
17-10-16|16 2016 Jan 12:34:55|03:55|16-11-16|11 2016 Jan 12:34:55|07:55|

NOTE: Though we could use -ioption of sed but it is not good practice to use it with large size files, it is better to use redirect option of standard output to a temp file and then rename it to the orginal Input_file.

Thanks,
R. Singh

Last edited by RavinderSingh13; 11-12-2016 at 10:22 AM.. Reason: Addeda note here also with solution now too.

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