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root@SERVER ~$ df
Filesystem  512-blocks  Free    %Used   Iused   %Iused  Mounted on
/dev/YXCV   655360      365632  45% 6322    13% /
/dev/ASDF   3801088     670648  83% 41759   32% /usr
/dev/ASR    1048576     500496  53% 5555    9%  /var

how can I pipe the df commands output to only display lines that has more usage then 80%?

e.g.: it would only display:

/dev/ASDF   3801088     670648  83% 41759   32% /usr
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2 Answers

up vote 5 down vote accepted

Assuming you don't have device names containing spaces (which are a pain when it comes to parsing the output of df):

df -P | awk '+$5 >= 80 {print}'

Adapt the field number if you want to use your implementation's df output format rather than the POSIX format.

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df -P | awk '$5 >= 80 {print}' works for me: can you include a note about the benefit of using the substr? Thank you. –  jasonwryan Jun 16 '11 at 9:41
    
@jasonwryan: I didn't remember offhand whether awk ignored trailing non-numeric characters when interpreting a string as a number. It does, so indeed there's no need to remove the trailing % explicitly. –  Gilles Jun 16 '11 at 9:56
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'$5 >= 80 works, ie. it ignores the trailing %, but < > == don't work in the same manner... whereas the (previous edit) subtring version seem to work for most comparison situations, but it too fails when comparing to < 100 ... I guess that is because it is comparing a sub-string.. –  Peter.O Jun 16 '11 at 13:16
    
@fred: Oh, I see. Numeric conversion does ignore a non-numeric suffix, but the comparison operators work on strings, so here the operator doing a string comparison unless both strings are numeric. The best way is to force the string to a number (with the + operator). –  Gilles Jun 16 '11 at 14:05
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df | egrep "([89][0-9]|100)%"

will do the trick.

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and what happens when i have 92% free on a mount point? –  LanceBaynes Jun 16 '11 at 7:22
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It works fine for 92%; it works fine for 80 thru 100%... I'm quite puzzled about why someone marked it down.... maybe it is because my df output is different.... Aha! I just checked: my default output only shows Filesystem 1K-blocks Used Available Use% Mounted on ... so it just depends on what your output is (as mentioned in Gilles answer).. If there is a second % column (as in the question), a trailing .*% should work: df | egrep "([89][0-9]|100)%.*%" ...Now I understand why someone marked down... –  Peter.O Jun 16 '11 at 14:51
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