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Inserting filename at the top of file

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# 1  
Old 04-09-2013
Inserting filename at the top of file
Hi Forum members,

I want to insert the filename at the top of file (i.e, first row only)

My file name is like
Code:
 asdf_432

And I want to insert this filename in first row as
Code:
filename is asdf with serial no. 432

Thanks in advance. Smilie
# 2  
Old 04-09-2013
Code:
#! /bin/bash

f="asdf_432"
x=${f%_*}
y=${f#*_}

sed -i.bak "1i filename is $x serial no. $y" $f

This User Gave Thanks to balajesuri For This Post:
CAch
# 3  
Old 04-09-2013
Try also:
Code:
$ echo filename is ${f%_*} serial no. ${f#*_} | cat - $f

This User Gave Thanks to RudiC For This Post:
CAch
# 4  
Old 04-11-2013
Code given above are working well, but what if the filename consists of more than 1 underscore. And I want to apply this condition on last underscore. i.e, my filename is like:
Code:
asdf_01_1234

And I need to print :
Code:
Filename is asdf_01 with serial no. 1234

at the top of the file.

Thanks in advance.
# 5  
Old 04-11-2013
Hey, come on, be reasonable, and be creative. If you want to print "with", embed "with" into the text.
And, for "last underscore", man bash:
Quote:
${parameter#word}
${parameter##word}
Remove matching prefix pattern. The word is expanded to produce a pattern just as in pathname expansion. If the pattern
matches the beginning of the value of parameter, then the result of the expansion is the expanded value of parameter with the
shortest matching pattern (the ``#'' case) or the longest matching pattern (the ``##'' case) deleted.
This User Gave Thanks to RudiC For This Post:
CAch
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