CODEWITHSUNDEEP
linuxbash
innervoice
innervoice

Reputation: 118

Removing particular data from file

I have file which contains list of IPs. Among those IPs I want to remove IPs with 10.0.1.x series.

So to check those IPs I used following command

grep -F "10.0.1." IPList.txt

However how to remove those IPs from IPList.txt as I have to provide this IPList.txt file as an input to another script.

Upvotes: 0

Views: 34

Answers (2)

Cyrus
Cyrus

Reputation: 88583

With GNU sed:

sed '/^10\.0\.1\./d' IPList.txt

If you want to edit your file "in place" use sed's option -i.

Upvotes: 2

Elliott Frisch
Elliott Frisch

Reputation: 201439

One possible option is to use grep -v, the GNU Grep 2.23 man page says, in part,

-v
--invert-match

    Invert the sense of matching, to select non-matching lines.
    (-v is specified by POSIX.)

something like

grep -v "10.0.1." < IPList.txt > IPList-nolocal.txt

which will copy IPList.txt to IPList-nolocal.txt excluding any lines that match 10.0.1.

If you want to see the output as you run it, you could use the tee command (the linked Wikipedia article begins normally used to split the output of a program so that it can be both displayed and saved in a file)

grep -v "10.0.1." < IPList.txt | tee IPList-nolocal.txt

Upvotes: 2

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