Test For Value in a File

[Michael42]

Hello,

Could someone please give me an example of testing a file for a string and if it does not exist in it appending a new line\entry into it. I am testing for a hostname.

Thanks very much for your help!

Michael

 

[vgersh99]

man grep

vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[abarad]

> cat host.txt
text1
text2
text3

> cat z
cnt=`grep -ic &quot;text5&quot; host.txt`
if [ $cnt -eq 0 ]; then
echo &quot;text5&quot; >> host.txt
fi

> z
> cat host.txt
text1
text2
text3
text5