Text processing using bash

Question

I have a vmstat dump file that has the header and values in this format

procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------  
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st  
12  0 5924396 20810624 548548 935160    0    0     0     5    0    0 60  5 34  0  0  
12  0 5924396 20768588 548548 935160    0    0     0     0 1045 1296 99  0  0  0  0  
12  0 5924396 20768968 548548 935452    0    0     0    32 1025 1288 100  0  0  0  0  
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------  
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st  
 4  0 5924396 20768724 548552 935408    0    0     0    92 1093 1377 33  0 67  0  0

I'm writing a script in bash that extracts just the lines containing lines with numbers i.e. values and remove all lines containing the alphabet. How do I do that

grep '[0-9]' filename should work. Then save the output to whatever file you want. (awk could do the same pretty easily.) I'm assuming the file is as you show - the non-numeric lines have no numbers in them. If this isn't the case, you could tweak the search. — Telemachus
– Telemachus, Commented Nov 12, 2011 at 18:18

ДМИТРИЙ МАЛИКОВ · Accepted Answer · 2011-11-12 18:41:42Z

1

If you need a lines with numbers and tabs\spaces only, grep -P "^[0-9\ \t]*$" should helps you.

$> cat ./text | grep -P "^[0-9\ \t]*$"
12  0 5924396 20810624 548548 935160    0    0     0     5    0    0 60  5 34  0  0  
12  0 5924396 20768588 548548 935160    0    0     0     0 1045 1296 99  0  0  0  0  
12  0 5924396 20768968 548548 935452    0    0     0    32 1025 1288 100  0  0  0  0  
 4  0 5924396 20768724 548552 935408    0    0     0    92 1093 1377 33  0 67  0  0

edited Nov 12, 2011 at 18:41

answered Nov 12, 2011 at 18:30

ДМИТРИЙ МАЛИКОВ

22.1k11 gold badges82 silver badges133 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

LisztLi · Accepted Answer · 2011-11-12 18:19:46Z

0

cat filename | grep "[0-9]"

answered Nov 12, 2011 at 18:19

LisztLi

2421 gold badge2 silver badges6 bronze badges

1 Comment

Shawn Chin Over a year ago

You can do away with cat and simply do grep <pattern> filename

Collectives™ on Stack Overflow

Text processing using bash

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related