Grep word matching

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This is strange. I want only to grep line containing /run. But it returning other lines too.

 [root@s5 ~]# df -h | grep -w "tm"
 [root@s5 ~]# df -h | grep -w "tmpfs"
 tmpfs 489M 0 489M 0% /dev/shm
 tmpfs 489M 6.8M 483M 2% /run
 tmpfs 489M 0 489M 0% /sys/fs/cgroup
 tmpfs 98M 0 98M 0% /run/user/1001
 tmpfs 98M 0 98M 0% /run/user/0
 [root@s5 ~]# df -h | grep -w "tmpf"
 [root@s5 ~]# df -h | grep -w "/run"
 tmpfs 489M 6.8M 483M 2% /run
 tmpfs 98M 0 98M 0% /run/user/1001
 tmpfs 98M 0 98M 0% /run/user/0

edited Dec 7 '17 at 10:18

Jeff Schaller

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asked Dec 7 '17 at 9:16

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up vote
-2
down vote

favorite

This is strange. I want only to grep line containing /run. But it returning other lines too.

 [root@s5 ~]# df -h | grep -w "tm"
 [root@s5 ~]# df -h | grep -w "tmpfs"
 tmpfs 489M 0 489M 0% /dev/shm
 tmpfs 489M 6.8M 483M 2% /run
 tmpfs 489M 0 489M 0% /sys/fs/cgroup
 tmpfs 98M 0 98M 0% /run/user/1001
 tmpfs 98M 0 98M 0% /run/user/0
 [root@s5 ~]# df -h | grep -w "tmpf"
 [root@s5 ~]# df -h | grep -w "/run"
 tmpfs 489M 6.8M 483M 2% /run
 tmpfs 98M 0 98M 0% /run/user/1001
 tmpfs 98M 0 98M 0% /run/user/0

edited Dec 7 '17 at 10:18

Jeff Schaller

32k848109

asked Dec 7 '17 at 9:16

again

1237

add a commentÂ |Â

up vote
-2
down vote

favorite

This is strange. I want only to grep line containing /run. But it returning other lines too.

 [root@s5 ~]# df -h | grep -w "tm"
 [root@s5 ~]# df -h | grep -w "tmpfs"
 tmpfs 489M 0 489M 0% /dev/shm
 tmpfs 489M 6.8M 483M 2% /run
 tmpfs 489M 0 489M 0% /sys/fs/cgroup
 tmpfs 98M 0 98M 0% /run/user/1001
 tmpfs 98M 0 98M 0% /run/user/0
 [root@s5 ~]# df -h | grep -w "tmpf"
 [root@s5 ~]# df -h | grep -w "/run"
 tmpfs 489M 6.8M 483M 2% /run
 tmpfs 98M 0 98M 0% /run/user/1001
 tmpfs 98M 0 98M 0% /run/user/0

edited Dec 7 '17 at 10:18

Jeff Schaller

32k848109

asked Dec 7 '17 at 9:16

again

1237

This is strange. I want only to grep line containing /run. But it returning other lines too.

 [root@s5 ~]# df -h | grep -w "tm"
 [root@s5 ~]# df -h | grep -w "tmpfs"
 tmpfs 489M 0 489M 0% /dev/shm
 tmpfs 489M 6.8M 483M 2% /run
 tmpfs 489M 0 489M 0% /sys/fs/cgroup
 tmpfs 98M 0 98M 0% /run/user/1001
 tmpfs 98M 0 98M 0% /run/user/0
 [root@s5 ~]# df -h | grep -w "tmpf"
 [root@s5 ~]# df -h | grep -w "/run"
 tmpfs 489M 6.8M 483M 2% /run
 tmpfs 98M 0 98M 0% /run/user/1001
 tmpfs 98M 0 98M 0% /run/user/0

edited Dec 7 '17 at 10:18

Jeff Schaller

32k848109

asked Dec 7 '17 at 9:16

again

1237

edited Dec 7 '17 at 10:18

Jeff Schaller

32k848109

edited Dec 7 '17 at 10:18

Jeff Schaller

32k848109

edited Dec 7 '17 at 10:18

Jeff Schaller

32k848109

asked Dec 7 '17 at 9:16

again

1237

asked Dec 7 '17 at 9:16

again

1237

asked Dec 7 '17 at 9:16

again

1237

add a commentÂ |Â

1 Answer
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man grep:

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore.

Works as expected, I say. If your intention is to get only the first match you should use

$ df -h | grep -w "/run$"

answered Dec 7 '17 at 9:22

Murphy

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1 Answer
1

active

oldest

votes

up vote
3
down vote

accepted

man grep:

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore.

Works as expected, I say. If your intention is to get only the first match you should use

$ df -h | grep -w "/run$"

answered Dec 7 '17 at 9:22

Murphy

1,7471517

add a commentÂ |Â

up vote
3
down vote

accepted

man grep:

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore.

Works as expected, I say. If your intention is to get only the first match you should use

$ df -h | grep -w "/run$"

answered Dec 7 '17 at 9:22

Murphy

1,7471517

add a commentÂ |Â

up vote
3
down vote

accepted

man grep:

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore.

Works as expected, I say. If your intention is to get only the first match you should use

$ df -h | grep -w "/run$"

answered Dec 7 '17 at 9:22

Murphy

1,7471517

man grep:

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore.

Works as expected, I say. If your intention is to get only the first match you should use

$ df -h | grep -w "/run$"

answered Dec 7 '17 at 9:22

Murphy

1,7471517

answered Dec 7 '17 at 9:22

Murphy

1,7471517

answered Dec 7 '17 at 9:22

Murphy

1,7471517

answered Dec 7 '17 at 9:22

Murphy

1,7471517

add a commentÂ |Â

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