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sed command to replace a character at last

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Top Forums Shell Programming and Scripting sed command to replace a character at last
# 8  
Old 06-08-2011
try this ..
Code:
$ echo "inform|10.232.167.18|1|1|50|25|0|0|0|5|1|1|78|0037|" | sed 's,|[0-9][0-9]|[0-9][0-9][0-9][0-9]|,|AA|AAAA|,g'

inform|10.232.167.18|1|1|50|25|0|0|0|5|1|1|AA|AAAA|

Last edited by Franklin52; 06-08-2011 at 11:06 AM.. Reason: Please use code tags, thank you
# 9  
Old 06-08-2011
Awk writes to the stdout.
If you don't want to create a temp file and must want to edit the original file. use perl (posted by getmmg).
# 10  
Old 06-08-2011
Quote:
Originally Posted by jayan_jay
try this ..
$ echo "inform|10.232.167.18|1|1|50|25|0|0|0|5|1|1|78|0037|" | sed 's,|[0-9][0-9]|[0-9][0-9][0-9][0-9]|,|AA|AAAA|,g'

inform|10.232.167.18|1|1|50|25|0|0|0|5|1|1|AA|AAAA|
or more simply

Code:
$ echo "inform|10.232.167.18|1|1|50|25|0|0|0|5|1|1|78|0037|" | sed 's:[^|]*|[^|]*|$:AA|AAAA|:'
inform|10.232.167.18|1|1|50|25|0|0|0|5|1|1|AA|AAAA|

# 11  
Old 06-08-2011
borrowing from anchal_khare:
Code:
{ rm file; awk -F\| '{$(NF-1)="AAAA";$(NF-2)="AA";print}' OFS=\| file; } < file

# 12  
Old 06-08-2011
Quote:
Originally Posted by vgersh99
borrowing from anchal_khare:
Code:
{ rm file; awk -F\| '{$(NF-1)="AAAA";$(NF-2)="AA";print}' OFS=\| file; } < file

I believe you meant to redirect AWK's stdout to "file". Otherwise, AWK will try to open ./file for reading, a pathname which does not exist after the rm.

As with any use of the unlink trick, should the last process holding open a file descriptor to the original "file" crash, you've lost the data (just a heads up for novices Smilie).

Regards,
Alister
This User Gave Thanks to alister For This Post:
vgersh99
# 13  
Old 06-08-2011
Quote:
Originally Posted by alister
I believe you meant to redirect AWK's stdout to "file". Otherwise, AWK will try to open ./file for reading, a pathname which does not exist after the rm.

As with any use of the unlink trick, should the last process holding open a file descriptor to the original "file" crash, you've lost the data (just a heads up for novices Smilie).

Regards,
Alister
ooops, fat fingers - good catch, thanks!
Code:
{ rm file; awk -F\| '{$(NF-1)="AAAA";$(NF-2)="AA";print}' OFS=\| > file; } < file
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