strip all from line starting after whitespace
I have a file with this content:
lines
lines
rootdev=UUID=967d8dc3-f595-4a6e-929e-cc89as5a1a2s / ext4 defaults,
lines
I am searching for one line command which should strip everything in the line rootdev after whitespace, so the final content should be like:
lines
lines
rootdev=UUID=967d8dc3-f595-4a6e-929e-cc89as5a1a2s
lines
Any idea how to do it with one line command? (so I do not need to open nano with this file and do it manually)
I tried with sed but it just replaces the word rootdev
sed -i 's/rootdev//g' file.txt
linux sed sh
edited Nov 21 '18 at 12:24
Inian
39k63770
asked Nov 21 '18 at 11:59
peterpeter
1,38852246
add a comment |
I have a file with this content:
lines
lines
rootdev=UUID=967d8dc3-f595-4a6e-929e-cc89as5a1a2s / ext4 defaults,
lines
I am searching for one line command which should strip everything in the line rootdev after whitespace, so the final content should be like:
lines
lines
rootdev=UUID=967d8dc3-f595-4a6e-929e-cc89as5a1a2s
lines
Any idea how to do it with one line command? (so I do not need to open nano with this file and do it manually)
I tried with sed but it just replaces the word rootdev
sed -i 's/rootdev//g' file.txt
linux sed sh
edited Nov 21 '18 at 12:24
Inian
39k63770
asked Nov 21 '18 at 11:59
peterpeter
1,38852246
add a comment |
I have a file with this content:
lines
lines
rootdev=UUID=967d8dc3-f595-4a6e-929e-cc89as5a1a2s / ext4 defaults,
lines
I am searching for one line command which should strip everything in the line rootdev after whitespace, so the final content should be like:
lines
lines
rootdev=UUID=967d8dc3-f595-4a6e-929e-cc89as5a1a2s
lines
Any idea how to do it with one line command? (so I do not need to open nano with this file and do it manually)
I tried with sed but it just replaces the word rootdev
sed -i 's/rootdev//g' file.txt
linux sed sh
edited Nov 21 '18 at 12:24
Inian
39k63770
asked Nov 21 '18 at 11:59
peterpeter
1,38852246
I have a file with this content:
lines
lines
rootdev=UUID=967d8dc3-f595-4a6e-929e-cc89as5a1a2s / ext4 defaults,
lines
I am searching for one line command which should strip everything in the line rootdev after whitespace, so the final content should be like:
lines
lines
rootdev=UUID=967d8dc3-f595-4a6e-929e-cc89as5a1a2s
lines
Any idea how to do it with one line command? (so I do not need to open nano with this file and do it manually)
I tried with sed but it just replaces the word rootdev
sed -i 's/rootdev//g' file.txt
linux sed sh
linux sed sh
edited Nov 21 '18 at 12:24
Inian
39k63770
asked Nov 21 '18 at 11:59
peterpeter
1,38852246
edited Nov 21 '18 at 12:24
Inian
39k63770
asked Nov 21 '18 at 11:59
peterpeter
1,38852246
edited Nov 21 '18 at 12:24
Inian
39k63770
edited Nov 21 '18 at 12:24
Inian
39k63770
edited Nov 21 '18 at 12:24
Inian
39k63770
39k63770
asked Nov 21 '18 at 11:59
peterpeter
1,38852246
asked Nov 21 '18 at 11:59
peterpeter
1,38852246
asked Nov 21 '18 at 11:59
peterpeter
1,38852246
1,38852246
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Your attempt with sed can't work because it would just remove rootdev string with an empty string. What you need is a tool that matches a pattern and does an action on that whole line for which I think awk is more recommended than sed.
Using awk to match the line to strip off the spaces using gsub() should be sufficient,
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
If you are using GNU awk with version greater than 4.1.0, you could use its in-place edit option to make the changes dynamically
gawk -i inplace '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
for earlier versions, use a temporary file
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file > temp && mv temp file
or use sponge from moreutils. If its not available in your system do get it on RHEL using yum install moreutils or with apt-get in Debian.
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file | sponge file
answered Nov 21 '18 at 12:07
InianInian
39k63770
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
add a comment |
First, search for a line beginning with rootdev=, and when you find it delete everything after the first whitespace until the end of line.
sed -i '/^rootdev=/ s/ .*$//' file
Using a capturing group to keep rootdev=... part in, and replacing the whole line with it is an option too.
sed -i 's/^(rootdev=[^ ]*).*$/1/' file
answered Nov 21 '18 at 12:24
oguzismailoguzismail
3,36531025
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
Both mine and Inian's solutions work with your example. Please see stackoverflow.com/help/mcve and edit your question accordingly if you want us to help you.
– oguzismail
Nov 22 '18 at 14:02
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your attempt with sed can't work because it would just remove rootdev string with an empty string. What you need is a tool that matches a pattern and does an action on that whole line for which I think awk is more recommended than sed.
Using awk to match the line to strip off the spaces using gsub() should be sufficient,
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
If you are using GNU awk with version greater than 4.1.0, you could use its in-place edit option to make the changes dynamically
gawk -i inplace '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
for earlier versions, use a temporary file
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file > temp && mv temp file
or use sponge from moreutils. If its not available in your system do get it on RHEL using yum install moreutils or with apt-get in Debian.
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file | sponge file
answered Nov 21 '18 at 12:07
InianInian
39k63770
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
add a comment |
Your attempt with sed can't work because it would just remove rootdev string with an empty string. What you need is a tool that matches a pattern and does an action on that whole line for which I think awk is more recommended than sed.
Using awk to match the line to strip off the spaces using gsub() should be sufficient,
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
If you are using GNU awk with version greater than 4.1.0, you could use its in-place edit option to make the changes dynamically
gawk -i inplace '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
for earlier versions, use a temporary file
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file > temp && mv temp file
or use sponge from moreutils. If its not available in your system do get it on RHEL using yum install moreutils or with apt-get in Debian.
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file | sponge file
answered Nov 21 '18 at 12:07
InianInian
39k63770
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
add a comment |
Your attempt with sed can't work because it would just remove rootdev string with an empty string. What you need is a tool that matches a pattern and does an action on that whole line for which I think awk is more recommended than sed.
Using awk to match the line to strip off the spaces using gsub() should be sufficient,
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
If you are using GNU awk with version greater than 4.1.0, you could use its in-place edit option to make the changes dynamically
gawk -i inplace '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
for earlier versions, use a temporary file
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file > temp && mv temp file
or use sponge from moreutils. If its not available in your system do get it on RHEL using yum install moreutils or with apt-get in Debian.
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file | sponge file
answered Nov 21 '18 at 12:07
InianInian
39k63770
Your attempt with sed can't work because it would just remove rootdev string with an empty string. What you need is a tool that matches a pattern and does an action on that whole line for which I think awk is more recommended than sed.
Using awk to match the line to strip off the spaces using gsub() should be sufficient,
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
If you are using GNU awk with version greater than 4.1.0, you could use its in-place edit option to make the changes dynamically
gawk -i inplace '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file
for earlier versions, use a temporary file
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file > temp && mv temp file
or use sponge from moreutils. If its not available in your system do get it on RHEL using yum install moreutils or with apt-get in Debian.
awk '/^rootdev/{ gsub(/[[:space:]].*/,"",$0) }1' file | sponge file
answered Nov 21 '18 at 12:07
InianInian
39k63770
edited Nov 21 '18 at 13:45
answered Nov 21 '18 at 12:07
InianInian
39k63770
answered Nov 21 '18 at 12:07
InianInian
39k63770
answered Nov 21 '18 at 12:07
InianInian
39k63770
39k63770
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
add a comment |
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
add a comment |
First, search for a line beginning with rootdev=, and when you find it delete everything after the first whitespace until the end of line.
sed -i '/^rootdev=/ s/ .*$//' file
Using a capturing group to keep rootdev=... part in, and replacing the whole line with it is an option too.
sed -i 's/^(rootdev=[^ ]*).*$/1/' file
answered Nov 21 '18 at 12:24
oguzismailoguzismail
3,36531025
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
Both mine and Inian's solutions work with your example. Please see stackoverflow.com/help/mcve and edit your question accordingly if you want us to help you.
– oguzismail
Nov 22 '18 at 14:02
add a comment |
First, search for a line beginning with rootdev=, and when you find it delete everything after the first whitespace until the end of line.
sed -i '/^rootdev=/ s/ .*$//' file
Using a capturing group to keep rootdev=... part in, and replacing the whole line with it is an option too.
sed -i 's/^(rootdev=[^ ]*).*$/1/' file
answered Nov 21 '18 at 12:24
oguzismailoguzismail
3,36531025
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
Both mine and Inian's solutions work with your example. Please see stackoverflow.com/help/mcve and edit your question accordingly if you want us to help you.
– oguzismail
Nov 22 '18 at 14:02
add a comment |
First, search for a line beginning with rootdev=, and when you find it delete everything after the first whitespace until the end of line.
sed -i '/^rootdev=/ s/ .*$//' file
Using a capturing group to keep rootdev=... part in, and replacing the whole line with it is an option too.
sed -i 's/^(rootdev=[^ ]*).*$/1/' file
answered Nov 21 '18 at 12:24
oguzismailoguzismail
3,36531025
First, search for a line beginning with rootdev=, and when you find it delete everything after the first whitespace until the end of line.
sed -i '/^rootdev=/ s/ .*$//' file
Using a capturing group to keep rootdev=... part in, and replacing the whole line with it is an option too.
sed -i 's/^(rootdev=[^ ]*).*$/1/' file
answered Nov 21 '18 at 12:24
oguzismailoguzismail
3,36531025
edited Nov 21 '18 at 14:23
answered Nov 21 '18 at 12:24
oguzismailoguzismail
3,36531025
answered Nov 21 '18 at 12:24
oguzismailoguzismail
3,36531025
answered Nov 21 '18 at 12:24
oguzismailoguzismail
3,36531025
3,36531025
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
Both mine and Inian's solutions work with your example. Please see stackoverflow.com/help/mcve and edit your question accordingly if you want us to help you.
– oguzismail
Nov 22 '18 at 14:02
add a comment |
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
Both mine and Inian's solutions work with your example. Please see stackoverflow.com/help/mcve and edit your question accordingly if you want us to help you.
– oguzismail
Nov 22 '18 at 14:02
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
hi, in my case it does not work (file content stays the same).
– peter
Nov 22 '18 at 12:20
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
what I tried - to use "cut" program and strip everything from char 50. But now I have no idea how to save output of cut to file.
– peter
Nov 22 '18 at 12:33
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
I solved it with: sudo cut --complement -c50-999 file > file 2&& sudo mv file2 file
– peter
Nov 22 '18 at 12:41
Both mine and Inian's solutions work with your example. Please see stackoverflow.com/help/mcve and edit your question accordingly if you want us to help you.
– oguzismail
Nov 22 '18 at 14:02
Both mine and Inian's solutions work with your example. Please see stackoverflow.com/help/mcve and edit your question accordingly if you want us to help you.
– oguzismail
Nov 22 '18 at 14:02
add a comment |
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