search file contains word
 

how to differ whether the file contains a word or not in shell script?
is there any simple command?

Use grep. simple sysntax:
see man 1 grep for details.

Yes, grep is your friend. And should you be looking for which files contain the word (non case sensitive) in and below the current directory, use

Im not following u guys. Why should I type the word? cud u gimme the example instead of syntax?

as an example, to see if "hello.txt" contains "bob", you would type:

i've done that command in shell script

if grep for file
then
echo "The file contains the word"
else
echo "The file doesn't contain the word"
fi

output
fahrisal@linux:~> sh wordscript
for FILE in $*
The file contains the word

then I was asked by my mentor "to modify whether a parameter was passed before commencing the greppin process." wht does it mean? i dont get it.