All I want to do is replace the 2nd line in a file with a variable, eg,
var=xxx
the file 'test' containing:
aaa
bbb
ccc
replace bbb with xxx
aaa
xxx
ccc
I had it working with sed on a redhat machine, but it doesn't work on a mac machine.
All I want to do is replace the 2nd line in a file with a variable, eg,
var=xxx
the file 'test' containing:
aaa
bbb
ccc
replace bbb with xxx
aaa
xxx
ccc
I had it working with sed on a redhat machine, but it doesn't work on a mac machine.
you can use sed or awk...
awk -v var="$your_var" 'NR==2{gsub($0,var)}{print}' filename
That is just writing to standard out, not editing the actual file. I could redirect and mv it, but the files are large and I'd like to avoid having to do that.
can be achieved using a tee
awk '{.....}' filename | tee filename
I don't have much idea on "perl"..check for more options on editing on a particular line .
This might help you for inline coding
perl -i -pe 's/bbb/xxx/i;' file_name.txt
---------- Post updated at 10:07 PM ---------- Previous update was at 10:04 PM ----------
Good Rakesh ... I was thinking there will be some alternative to "perl"..since i prefer to do it in awk