How to use sed to modify last 3 digit of a line with random number when a string matches in a file
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I have a file 'a.txt' which have a content:
K8A2-19C204-BA109691
ML_18.10.4-109691
How can i search for a string say "ML_" in the file and if it matches modify last 3 digit of that line with some random numbers using 'sed' command in bash script.
I am able to change the last 3 numbers to some fixed numbers with the command:
sed -i '/ML_/s/[0-9][0-9][0-9]$/012/' file_name
But not sure how to change with random numbers
command-line text-processing sed
edited Mar 22 at 1:54
muru
130k19273463
asked Mar 21 at 17:24
Deepak
31
add a comment |Â
up vote
0
down vote
favorite
I have a file 'a.txt' which have a content:
K8A2-19C204-BA109691
ML_18.10.4-109691
How can i search for a string say "ML_" in the file and if it matches modify last 3 digit of that line with some random numbers using 'sed' command in bash script.
I am able to change the last 3 numbers to some fixed numbers with the command:
sed -i '/ML_/s/[0-9][0-9][0-9]$/012/' file_name
But not sure how to change with random numbers
command-line text-processing sed
edited Mar 22 at 1:54
muru
130k19273463
asked Mar 21 at 17:24
Deepak
31
this stackoverflow.com/questions/1194882/… could help
– Lety
Mar 21 at 17:39
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have a file 'a.txt' which have a content:
K8A2-19C204-BA109691
ML_18.10.4-109691
How can i search for a string say "ML_" in the file and if it matches modify last 3 digit of that line with some random numbers using 'sed' command in bash script.
I am able to change the last 3 numbers to some fixed numbers with the command:
sed -i '/ML_/s/[0-9][0-9][0-9]$/012/' file_name
But not sure how to change with random numbers
command-line text-processing sed
edited Mar 22 at 1:54
muru
130k19273463
asked Mar 21 at 17:24
Deepak
31
I have a file 'a.txt' which have a content:
K8A2-19C204-BA109691
ML_18.10.4-109691
How can i search for a string say "ML_" in the file and if it matches modify last 3 digit of that line with some random numbers using 'sed' command in bash script.
I am able to change the last 3 numbers to some fixed numbers with the command:
sed -i '/ML_/s/[0-9][0-9][0-9]$/012/' file_name
But not sure how to change with random numbers
command-line text-processing sed
command-line text-processing sed
edited Mar 22 at 1:54
muru
130k19273463
asked Mar 21 at 17:24
Deepak
31
edited Mar 22 at 1:54
muru
130k19273463
asked Mar 21 at 17:24
Deepak
31
edited Mar 22 at 1:54
muru
130k19273463
edited Mar 22 at 1:54
muru
130k19273463
edited Mar 22 at 1:54
muru
130k19273463
130k19273463
asked Mar 21 at 17:24
Deepak
31
asked Mar 21 at 17:24
Deepak
31
asked Mar 21 at 17:24
Deepak
31
31
this stackoverflow.com/questions/1194882/… could help
– Lety
Mar 21 at 17:39
add a comment |Â
this stackoverflow.com/questions/1194882/… could help
– Lety
Mar 21 at 17:39
this stackoverflow.com/questions/1194882/… could help
– Lety
Mar 21 at 17:39
this stackoverflow.com/questions/1194882/… could help
– Lety
Mar 21 at 17:39
add a comment |Â
1 Answer
1
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oldest
votes
up vote
0
down vote
accepted
If you don't have any particular requirements for the randomness, then you can use the bash shell's built in RANDOM as mentioned in comments e.g.
$ sed '/^ML_/ s/[0-9]3$/'$(printf '%03d' $((RANDOM%1000)))'/' a.txt
K8A2-19C204-BA109691
ML_18.10.4-109133
If you require "better" random numbers, then I'd suggest abandoning sed in favor of perl and looking for a suitable random number module.
answered Mar 21 at 17:58
steeldriver
63.1k1198166
It worked,Thanks a lot :)
– Deepak
Mar 22 at 2:17
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
accepted
If you don't have any particular requirements for the randomness, then you can use the bash shell's built in RANDOM as mentioned in comments e.g.
$ sed '/^ML_/ s/[0-9]3$/'$(printf '%03d' $((RANDOM%1000)))'/' a.txt
K8A2-19C204-BA109691
ML_18.10.4-109133
If you require "better" random numbers, then I'd suggest abandoning sed in favor of perl and looking for a suitable random number module.
answered Mar 21 at 17:58
steeldriver
63.1k1198166
It worked,Thanks a lot :)
– Deepak
Mar 22 at 2:17
add a comment |Â
up vote
0
down vote
accepted
If you don't have any particular requirements for the randomness, then you can use the bash shell's built in RANDOM as mentioned in comments e.g.
$ sed '/^ML_/ s/[0-9]3$/'$(printf '%03d' $((RANDOM%1000)))'/' a.txt
K8A2-19C204-BA109691
ML_18.10.4-109133
If you require "better" random numbers, then I'd suggest abandoning sed in favor of perl and looking for a suitable random number module.
answered Mar 21 at 17:58
steeldriver
63.1k1198166
It worked,Thanks a lot :)
– Deepak
Mar 22 at 2:17
add a comment |Â
up vote
0
down vote
accepted
up vote
0
down vote
accepted
If you don't have any particular requirements for the randomness, then you can use the bash shell's built in RANDOM as mentioned in comments e.g.
$ sed '/^ML_/ s/[0-9]3$/'$(printf '%03d' $((RANDOM%1000)))'/' a.txt
K8A2-19C204-BA109691
ML_18.10.4-109133
If you require "better" random numbers, then I'd suggest abandoning sed in favor of perl and looking for a suitable random number module.
answered Mar 21 at 17:58
steeldriver
63.1k1198166
If you don't have any particular requirements for the randomness, then you can use the bash shell's built in RANDOM as mentioned in comments e.g.
$ sed '/^ML_/ s/[0-9]3$/'$(printf '%03d' $((RANDOM%1000)))'/' a.txt
K8A2-19C204-BA109691
ML_18.10.4-109133
If you require "better" random numbers, then I'd suggest abandoning sed in favor of perl and looking for a suitable random number module.
answered Mar 21 at 17:58
steeldriver
63.1k1198166
answered Mar 21 at 17:58
steeldriver
63.1k1198166
answered Mar 21 at 17:58
steeldriver
63.1k1198166
answered Mar 21 at 17:58
steeldriver
63.1k1198166
63.1k1198166
It worked,Thanks a lot :)
– Deepak
Mar 22 at 2:17
add a comment |Â
It worked,Thanks a lot :)
– Deepak
Mar 22 at 2:17
It worked,Thanks a lot :)
– Deepak
Mar 22 at 2:17
It worked,Thanks a lot :)
– Deepak
Mar 22 at 2:17
add a comment |Â
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this stackoverflow.com/questions/1194882/… could help
– Lety
Mar 21 at 17:39