Bash variables in sed including an end of line condition
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I have a bash variable replacement in sed, where some information at the end of line of the 3rd line for example should also be matched.
a=3 #line no
b=tap #pattern
c=9 #replacement data
sed "$as/$b$/$c/g"
The dollar to match the end of line doesn't seem to work, the one here $b$.
The script works without the dollar
For example, in a file :
3, 7, 9
1, 3, 5
11, 23, tap
which should become 11, 23, 9, I wanted the $ to identify tap as the last object. Now, tap can be a number too, so don't specialize it to a text.
shell sed
asked Feb 18 at 2:58
Pgram
113
 |Â
show 3 more comments
up vote
0
down vote
favorite
I have a bash variable replacement in sed, where some information at the end of line of the 3rd line for example should also be matched.
a=3 #line no
b=tap #pattern
c=9 #replacement data
sed "$as/$b$/$c/g"
The dollar to match the end of line doesn't seem to work, the one here $b$.
The script works without the dollar
For example, in a file :
3, 7, 9
1, 3, 5
11, 23, tap
which should become 11, 23, 9, I wanted the $ to identify tap as the last object. Now, tap can be a number too, so don't specialize it to a text.
shell sed
asked Feb 18 at 2:58
Pgram
113
Can you give a specific example of it not seeming to work? afaik a double-quoted$on its own shouldn't be subject to expansion (although you could try$if there's doubt)
– steeldriver
Feb 18 at 3:35
in a file, have three fields: 3, 4, 5 9, 8, 7 1, 3, tap should become 6, 7, 9
– Pgram
Feb 18 at 3:38
Well aside from thegmodifier not really making sense when the pattern is anchored, I don't see what the issue is here?
– steeldriver
Feb 18 at 3:53
What result is giving your abovesedcommand? maybe you forgot to tellsedthe input file it should run that replacement in?
– Î±Ò“sýιη
Feb 18 at 3:56
I've cat'ted the file before and after replacement. Nothing happens ! Do you think it has anything to do with file format ? It's a simple csv file
– Pgram
Feb 18 at 3:58
 |Â
show 3 more comments
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have a bash variable replacement in sed, where some information at the end of line of the 3rd line for example should also be matched.
a=3 #line no
b=tap #pattern
c=9 #replacement data
sed "$as/$b$/$c/g"
The dollar to match the end of line doesn't seem to work, the one here $b$.
The script works without the dollar
For example, in a file :
3, 7, 9
1, 3, 5
11, 23, tap
which should become 11, 23, 9, I wanted the $ to identify tap as the last object. Now, tap can be a number too, so don't specialize it to a text.
shell sed
asked Feb 18 at 2:58
Pgram
113
I have a bash variable replacement in sed, where some information at the end of line of the 3rd line for example should also be matched.
a=3 #line no
b=tap #pattern
c=9 #replacement data
sed "$as/$b$/$c/g"
The dollar to match the end of line doesn't seem to work, the one here $b$.
The script works without the dollar
For example, in a file :
3, 7, 9
1, 3, 5
11, 23, tap
which should become 11, 23, 9, I wanted the $ to identify tap as the last object. Now, tap can be a number too, so don't specialize it to a text.
shell sed
asked Feb 18 at 2:58
Pgram
113
edited Feb 18 at 4:03
asked Feb 18 at 2:58
Pgram
113
asked Feb 18 at 2:58
Pgram
113
asked Feb 18 at 2:58
Pgram
113
113
Can you give a specific example of it not seeming to work? afaik a double-quoted$on its own shouldn't be subject to expansion (although you could try$if there's doubt)
– steeldriver
Feb 18 at 3:35
in a file, have three fields: 3, 4, 5 9, 8, 7 1, 3, tap should become 6, 7, 9
– Pgram
Feb 18 at 3:38
Well aside from thegmodifier not really making sense when the pattern is anchored, I don't see what the issue is here?
– steeldriver
Feb 18 at 3:53
What result is giving your abovesedcommand? maybe you forgot to tellsedthe input file it should run that replacement in?
– Î±Ò“sýιη
Feb 18 at 3:56
I've cat'ted the file before and after replacement. Nothing happens ! Do you think it has anything to do with file format ? It's a simple csv file
– Pgram
Feb 18 at 3:58
 |Â
show 3 more comments
Can you give a specific example of it not seeming to work? afaik a double-quoted$on its own shouldn't be subject to expansion (although you could try$if there's doubt)
– steeldriver
Feb 18 at 3:35
in a file, have three fields: 3, 4, 5 9, 8, 7 1, 3, tap should become 6, 7, 9
– Pgram
Feb 18 at 3:38
Well aside from thegmodifier not really making sense when the pattern is anchored, I don't see what the issue is here?
– steeldriver
Feb 18 at 3:53
What result is giving your abovesedcommand? maybe you forgot to tellsedthe input file it should run that replacement in?
– Î±Ò“sýιη
Feb 18 at 3:56
I've cat'ted the file before and after replacement. Nothing happens ! Do you think it has anything to do with file format ? It's a simple csv file
– Pgram
Feb 18 at 3:58
Can you give a specific example of it not seeming to work? afaik a double-quoted
$ on its own shouldn't be subject to expansion (although you could try $ if there's doubt)– steeldriver
Feb 18 at 3:35
Can you give a specific example of it not seeming to work? afaik a double-quoted
$ on its own shouldn't be subject to expansion (although you could try $ if there's doubt)– steeldriver
Feb 18 at 3:35
in a file, have three fields: 3, 4, 5 9, 8, 7 1, 3, tap should become 6, 7, 9
– Pgram
Feb 18 at 3:38
in a file, have three fields: 3, 4, 5 9, 8, 7 1, 3, tap should become 6, 7, 9
– Pgram
Feb 18 at 3:38
Well aside from the
g modifier not really making sense when the pattern is anchored, I don't see what the issue is here?– steeldriver
Feb 18 at 3:53
Well aside from the
g modifier not really making sense when the pattern is anchored, I don't see what the issue is here?– steeldriver
Feb 18 at 3:53
What result is giving your above
sed command? maybe you forgot to tell sed the input file it should run that replacement in?– Î±Ò“sýιη
Feb 18 at 3:56
What result is giving your above
sed command? maybe you forgot to tell sed the input file it should run that replacement in?– Î±Ò“sýιη
Feb 18 at 3:56
I've cat'ted the file before and after replacement. Nothing happens ! Do you think it has anything to do with file format ? It's a simple csv file
– Pgram
Feb 18 at 3:58
I've cat'ted the file before and after replacement. Nothing happens ! Do you think it has anything to do with file format ? It's a simple csv file
– Pgram
Feb 18 at 3:58
 |Â
show 3 more comments
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Can you give a specific example of it not seeming to work? afaik a double-quoted
$on its own shouldn't be subject to expansion (although you could try$if there's doubt)– steeldriver
Feb 18 at 3:35
in a file, have three fields: 3, 4, 5 9, 8, 7 1, 3, tap should become 6, 7, 9
– Pgram
Feb 18 at 3:38
Well aside from the
gmodifier not really making sense when the pattern is anchored, I don't see what the issue is here?– steeldriver
Feb 18 at 3:53
What result is giving your above
sedcommand? maybe you forgot to tellsedthe input file it should run that replacement in?– Î±Ò“sýιη
Feb 18 at 3:56
I've cat'ted the file before and after replacement. Nothing happens ! Do you think it has anything to do with file format ? It's a simple csv file
– Pgram
Feb 18 at 3:58