Remove strings after each first word in a text file

F开发者_开发问答ile1:

hello   (OPTION1)   123456   123456   123456
world   (OPTION1)   123456   123456   123456
foo     (OPTION1)   123456   123456   123456
bar     (OPTION1)   123456   123456   123456

How would one remove each string after each first word in the textfile File1?

This would probably be down with awk/sed/cat - but I cannot figure it out. I'm still new to editing via these utilities - perhaps others will benefit from my question.

The first words are not predictive (no wild cards), each first word is unique.

awk one liner:

awk '{ print $1 }' < inputfile > outputfile

sed one liner:

sed 's/^\([A-Za-z0-9]*\).*/\1/' < inputfile > outpufile

why to use the those tools even after after having the cut command

cut -f1 -d"\t" filename

try

awk '{print $1}' filename > filename2

You can just trim everything from the first white space onwards:

sed '\s.*$//' <File1

Or just for fun, you could do it with perl

perl -ne '@a=split; print "$a[0]\n"' < file

To remove everything after a delimiter:

cut -f1 -d"\t" inputfile > outputfile

\t can be replaced with any other delimiter (e.g., ;) based on your specific case.