grep a variable

Shell Programming and Scripting
1

can i grep a variable
say i have a variable var=`hostname` and I want to make an if statement like
if grep "esp-ueh" $var;then......
how can i do this
I dont want to store this variable in a file and the grep it because my script will be used at the same time on multiple stations and then that file will keep getting overwritten.

2

var=`hostname`
if [[ `grep -c "esp-ueh" $var ` > 0 ]]; then
echo "exits"
else
echo "does not exists"
fi

cheers,
Devaraj Takhellambam

3

you can do that...var=$(...your command...) | grep "esp-ueh"if you want testif [ var="esp-ueh" ] then;...

4

protocomm does the command have to be in `command` for it to work coz when i echo $var it is empty

5

devtak the code doent seem to work.it always prints "does not exists"

6

devtak this is the error that i get
grep: esp-ueh32: No such file or directory
does not exist

7

set a variable

> myvar=alpha123

an exact way to show whats in a variable

> echo "${myvar}"
alpha123

show that ASCII values - each of those numbers is the ASCII representation of the characters. 97 is an 'a', 108 is 'l', and so on. the final 10 is code for a LF (line feed) terminator.

> echo "${myvar}" | od -An -t dC -w10
   97  108  112  104   97   49   50   51   10
8

======================

The marked line can be changed to

if [[ `echo $var | grep -c "esp-ueh" ` > 0 ]];

9

does anyone have any more suggestions coz both of them dont seem to work

10

it works now thanks