Shell Programming and Scripting

i hav file1
with contents:

welcome
this is first file
file name is file 1
last line of the file

now i want to check if the second line has sentence "this is first file" through
"if" statement from another file ...
is it possible if so how!!!

Am not sure if i get ur question correctly.pls let me know else.

You can try like this.

if [[ $(grep -c "If you have the pattern" FILE ) -gt 0 ]] ; then
echo "Has the pattern"
fi

try this:

Code:

sed '2s/"your search pattern/replacing patter/g" filename

In ennstate's post, I believe -c option will just return the count of occurance of the pattern.But here we need to find out if the pattern is present in the 2nd line...[if my understanding is correct].

I thnk the below approch will work well...

[[ $(grep -n 'this is first file' new1 | grep '2:this is first file') ]] && echo "Pattern found"

Also, we can use awk...

awk '{if ((NR==2) && ($0 == "this is first file" )) print "Pattern present" }' new1

this will return the line if the pattern is present in file new1 using sed
sed -n '/this is first file/{p;2q}' new1

more appropritate could be to quit from line 3, Something like this:

Code:

sed -n '3q; /search pattern/p' filename

Please let me know if you think otherwise....

If it is always the second line that you need to check, this will be much faster than using an external program such as sed or awk:

Code:

{
 IFS= read -r LINE
 IFS= read -r LINE
} < FILENAME

case $LINE in
  "this is first file") true ;;
   *) false ;;
esac