CODEWITHSUNDEEP
bashshellunixscriptinggrep
Vijesh Kk
Vijesh Kk

Reputation: 171

How to use varible as search string in egrep

I want perform multi-string search from a file using egrep, but use variable to store the search string values. this will help me to programmatically change the search strings. example:-

SEARCHSTRING='typesetting industry|printer took|specimen'
cat /tmp/input.file|egrep $SEARCHSTRING > /tmp/output.file

input.file content:

*Lorem Ipsum is simply dummy text of the printing and typesetting industry.  
Lorem Ipsum has been the industry's standard dummy text ever since the  
1500s, when an unknown printer took a galley of type and scrambled it to  
make a type specimen book. It has survived not only five centuries,   
but also the leap into electronic*

output.file content (expected):

*Lorem Ipsum is simply dummy text of the printing and typesetting industry.  
1500s, when an unknown printer took a galley of type and scrambled it to  
make a type specimen book. It has survived not only five centuries,*

Please help

Upvotes: 1

Views: 126

Answers (1)

P....
P....

Reputation: 18391

double quote the variable, also use grep -E over egrep 

egrep  "$SEARCHSTRING" inputfile
Lorem Ipsum is simply dummy text of the printing and typesetting industry.
1500s, when an unknown printer took a galley of type and scrambled it to
make a type specimen book. It has survived not only five centuries,

Upvotes: 2

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