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Old 08-05-2010, 06:11 PM   #1
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Registered: Aug 2010
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Question insert tab at beginning of each line in file - and other sed questions

Hello all,

Firstly, I've searched at length and can't seem to find the info so I decided to join this community and ask away. If this is a question that has been answered a billion times please point me in the right direction.

I am trying to create a shell script where a user can specify a file with a list of logins and the script will create a batch file with specific information in specific columns.


loginfile.txt has


I need the output to be as below:

1 User1 Date 12/31/9999
2 User2 Date 12/31/9999
3 User3 Date 12/31/9999

Where the columns are separated as below.

1[tab][tab]User1[tab]date +%D[tab]12/31/9999
2[tab][tab]User2[tab]date +%D[tab]12/31/9999
3[tab][tab]User3[tab]date +%D[tab]12/31/9999

I can use the nl utility to get the numbers easily enough, but I need two tab separations between the number and the user list. Is there a sed command that will insert at the beginning of each line? If so I can just run nl after I get some tabs up in the front.

Any assistance is appreciated.
Old 08-05-2010, 06:19 PM   #2
Registered: Oct 2007
Distribution: Arch x86_64
Posts: 606

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sed -i 's/^/\t\t/' <filename>
Old 08-05-2010, 06:27 PM   #3
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Registered: Aug 2010
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well that was simple!...I feel silly now.

Thanks very much Meson!



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