replace a substring using sed
I have a sample input file:
$ cat test.txt
xz:xx.d.r1.latest
Now I want to replace a part with new value. For ex: I wanted to replace r1 with r2 in the above text so the new o/p would be
xz:xx.d.r2.latest
I wanted to do this using variables. For example, consider the value to be replaced stored in variable old and the value to be replaced with in variable new:
$ old=r1
$ new=r2
Now for replacing, I tried
sed -i 's/'"${old}"'/'"${new}"'/g' test.txt
sed -i "s/$old}/${new}/g" test.txt
sed -i 's/'"$old"'/'"$new"'/g' test.txt
sed -i "s/${old}/${new}/g" test.txt
But none of them worked the value is not being replaced. So can anyone help me or tell whether the syntax is correct or what I am missing.
bash shell sed
edited May 16 '18 at 17:56
Arkadiusz Drabczyk
1,636711
asked May 16 '18 at 16:54
DENDULURI CHAITANYADENDULURI CHAITANYA
1
|
show 2 more comments
I have a sample input file:
$ cat test.txt
xz:xx.d.r1.latest
Now I want to replace a part with new value. For ex: I wanted to replace r1 with r2 in the above text so the new o/p would be
xz:xx.d.r2.latest
I wanted to do this using variables. For example, consider the value to be replaced stored in variable old and the value to be replaced with in variable new:
$ old=r1
$ new=r2
Now for replacing, I tried
sed -i 's/'"${old}"'/'"${new}"'/g' test.txt
sed -i "s/$old}/${new}/g" test.txt
sed -i 's/'"$old"'/'"$new"'/g' test.txt
sed -i "s/${old}/${new}/g" test.txt
But none of them worked the value is not being replaced. So can anyone help me or tell whether the syntax is correct or what I am missing.
bash shell sed
edited May 16 '18 at 17:56
Arkadiusz Drabczyk
1,636711
asked May 16 '18 at 16:54
DENDULURI CHAITANYADENDULURI CHAITANYA
1
All of these commands exceptsed -i "s/$old}/${new}/g" test.txtwork for me. Can you describe your problem in more details?
– Arkadiusz Drabczyk
May 16 '18 at 17:29
the values are not being replaced which I wanted. I think the command I used is not working
– DENDULURI CHAITANYA
May 16 '18 at 18:21
@ArkadiuszDrabczyk And that one didn't work cos you like he, were missing a {
– barlop
May 16 '18 at 19:16
The second and third commands are missing a { between the $ and o of ${old}
– barlop
May 16 '18 at 19:16
all four work for me(one must correct the second and third) pastebin.com/raw/dgr7dtmA
– barlop
May 16 '18 at 19:18
|
show 2 more comments
I have a sample input file:
$ cat test.txt
xz:xx.d.r1.latest
Now I want to replace a part with new value. For ex: I wanted to replace r1 with r2 in the above text so the new o/p would be
xz:xx.d.r2.latest
I wanted to do this using variables. For example, consider the value to be replaced stored in variable old and the value to be replaced with in variable new:
$ old=r1
$ new=r2
Now for replacing, I tried
sed -i 's/'"${old}"'/'"${new}"'/g' test.txt
sed -i "s/$old}/${new}/g" test.txt
sed -i 's/'"$old"'/'"$new"'/g' test.txt
sed -i "s/${old}/${new}/g" test.txt
But none of them worked the value is not being replaced. So can anyone help me or tell whether the syntax is correct or what I am missing.
bash shell sed
edited May 16 '18 at 17:56
Arkadiusz Drabczyk
1,636711
asked May 16 '18 at 16:54
DENDULURI CHAITANYADENDULURI CHAITANYA
1
I have a sample input file:
$ cat test.txt
xz:xx.d.r1.latest
Now I want to replace a part with new value. For ex: I wanted to replace r1 with r2 in the above text so the new o/p would be
xz:xx.d.r2.latest
I wanted to do this using variables. For example, consider the value to be replaced stored in variable old and the value to be replaced with in variable new:
$ old=r1
$ new=r2
Now for replacing, I tried
sed -i 's/'"${old}"'/'"${new}"'/g' test.txt
sed -i "s/$old}/${new}/g" test.txt
sed -i 's/'"$old"'/'"$new"'/g' test.txt
sed -i "s/${old}/${new}/g" test.txt
But none of them worked the value is not being replaced. So can anyone help me or tell whether the syntax is correct or what I am missing.
bash shell sed
bash shell sed
edited May 16 '18 at 17:56
Arkadiusz Drabczyk
1,636711
asked May 16 '18 at 16:54
DENDULURI CHAITANYADENDULURI CHAITANYA
1
edited May 16 '18 at 17:56
Arkadiusz Drabczyk
1,636711
asked May 16 '18 at 16:54
DENDULURI CHAITANYADENDULURI CHAITANYA
1
edited May 16 '18 at 17:56
Arkadiusz Drabczyk
1,636711
edited May 16 '18 at 17:56
Arkadiusz Drabczyk
1,636711
edited May 16 '18 at 17:56
Arkadiusz Drabczyk
1,636711
1,636711
asked May 16 '18 at 16:54
DENDULURI CHAITANYADENDULURI CHAITANYA
1
asked May 16 '18 at 16:54
DENDULURI CHAITANYADENDULURI CHAITANYA
1
asked May 16 '18 at 16:54
DENDULURI CHAITANYADENDULURI CHAITANYA
1
1
All of these commands exceptsed -i "s/$old}/${new}/g" test.txtwork for me. Can you describe your problem in more details?
– Arkadiusz Drabczyk
May 16 '18 at 17:29
the values are not being replaced which I wanted. I think the command I used is not working
– DENDULURI CHAITANYA
May 16 '18 at 18:21
@ArkadiuszDrabczyk And that one didn't work cos you like he, were missing a {
– barlop
May 16 '18 at 19:16
The second and third commands are missing a { between the $ and o of ${old}
– barlop
May 16 '18 at 19:16
all four work for me(one must correct the second and third) pastebin.com/raw/dgr7dtmA
– barlop
May 16 '18 at 19:18
|
show 2 more comments
All of these commands exceptsed -i "s/$old}/${new}/g" test.txtwork for me. Can you describe your problem in more details?
– Arkadiusz Drabczyk
May 16 '18 at 17:29
the values are not being replaced which I wanted. I think the command I used is not working
– DENDULURI CHAITANYA
May 16 '18 at 18:21
@ArkadiuszDrabczyk And that one didn't work cos you like he, were missing a {
– barlop
May 16 '18 at 19:16
The second and third commands are missing a { between the $ and o of ${old}
– barlop
May 16 '18 at 19:16
all four work for me(one must correct the second and third) pastebin.com/raw/dgr7dtmA
– barlop
May 16 '18 at 19:18
All of these commands except
sed -i "s/$old}/${new}/g" test.txt work for me. Can you describe your problem in more details?– Arkadiusz Drabczyk
May 16 '18 at 17:29
All of these commands except
sed -i "s/$old}/${new}/g" test.txt work for me. Can you describe your problem in more details?– Arkadiusz Drabczyk
May 16 '18 at 17:29
the values are not being replaced which I wanted. I think the command I used is not working
– DENDULURI CHAITANYA
May 16 '18 at 18:21
the values are not being replaced which I wanted. I think the command I used is not working
– DENDULURI CHAITANYA
May 16 '18 at 18:21
@ArkadiuszDrabczyk And that one didn't work cos you like he, were missing a {
– barlop
May 16 '18 at 19:16
@ArkadiuszDrabczyk And that one didn't work cos you like he, were missing a {
– barlop
May 16 '18 at 19:16
The second and third commands are missing a { between the $ and o of ${old}
– barlop
May 16 '18 at 19:16
The second and third commands are missing a { between the $ and o of ${old}
– barlop
May 16 '18 at 19:16
all four work for me(one must correct the second and third) pastebin.com/raw/dgr7dtmA
– barlop
May 16 '18 at 19:18
all four work for me(one must correct the second and third) pastebin.com/raw/dgr7dtmA
– barlop
May 16 '18 at 19:18
|
show 2 more comments
1 Answer
1
active
oldest
votes
In case you're using BSD's sed (e.g. on macOS), -i option is a non-standard FreeBSD extension and it requires an argument. So to make sure you're using the right cross-compatible syntax, you should change it to:
sed -i'.bak' ... # rest of the command
Other than that, your commands are fine. E.g.
sed -i'.bak' 's/'"${old}"'/'"${new}"'/g' test.txt
Tested in Bash shell on WSL (Ubuntu on Windows).
answered Feb 22 at 14:45
kenorbkenorb
11.5k1580116
add a comment |
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1 Answer
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1 Answer
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oldest
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votes
In case you're using BSD's sed (e.g. on macOS), -i option is a non-standard FreeBSD extension and it requires an argument. So to make sure you're using the right cross-compatible syntax, you should change it to:
sed -i'.bak' ... # rest of the command
Other than that, your commands are fine. E.g.
sed -i'.bak' 's/'"${old}"'/'"${new}"'/g' test.txt
Tested in Bash shell on WSL (Ubuntu on Windows).
answered Feb 22 at 14:45
kenorbkenorb
11.5k1580116
add a comment |
In case you're using BSD's sed (e.g. on macOS), -i option is a non-standard FreeBSD extension and it requires an argument. So to make sure you're using the right cross-compatible syntax, you should change it to:
sed -i'.bak' ... # rest of the command
Other than that, your commands are fine. E.g.
sed -i'.bak' 's/'"${old}"'/'"${new}"'/g' test.txt
Tested in Bash shell on WSL (Ubuntu on Windows).
answered Feb 22 at 14:45
kenorbkenorb
11.5k1580116
add a comment |
In case you're using BSD's sed (e.g. on macOS), -i option is a non-standard FreeBSD extension and it requires an argument. So to make sure you're using the right cross-compatible syntax, you should change it to:
sed -i'.bak' ... # rest of the command
Other than that, your commands are fine. E.g.
sed -i'.bak' 's/'"${old}"'/'"${new}"'/g' test.txt
Tested in Bash shell on WSL (Ubuntu on Windows).
answered Feb 22 at 14:45
kenorbkenorb
11.5k1580116
In case you're using BSD's sed (e.g. on macOS), -i option is a non-standard FreeBSD extension and it requires an argument. So to make sure you're using the right cross-compatible syntax, you should change it to:
sed -i'.bak' ... # rest of the command
Other than that, your commands are fine. E.g.
sed -i'.bak' 's/'"${old}"'/'"${new}"'/g' test.txt
Tested in Bash shell on WSL (Ubuntu on Windows).
answered Feb 22 at 14:45
kenorbkenorb
11.5k1580116
answered Feb 22 at 14:45
kenorbkenorb
11.5k1580116
answered Feb 22 at 14:45
kenorbkenorb
11.5k1580116
answered Feb 22 at 14:45
kenorbkenorb
11.5k1580116
11.5k1580116
add a comment |
add a comment |
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All of these commands except
sed -i "s/$old}/${new}/g" test.txtwork for me. Can you describe your problem in more details?– Arkadiusz Drabczyk
May 16 '18 at 17:29
the values are not being replaced which I wanted. I think the command I used is not working
– DENDULURI CHAITANYA
May 16 '18 at 18:21
@ArkadiuszDrabczyk And that one didn't work cos you like he, were missing a {
– barlop
May 16 '18 at 19:16
The second and third commands are missing a { between the $ and o of ${old}
– barlop
May 16 '18 at 19:16
all four work for me(one must correct the second and third) pastebin.com/raw/dgr7dtmA
– barlop
May 16 '18 at 19:18