perl -e "print qq/Hello world!\n/;" #### perl -n -e "print qq/$.:\t$_\n/;" textfile.txt #### while ( <> ) { .......... # Your code goes here. print $_; } #### perl -pe "s/\bperl\b/Perl/g;" textfile.txt #### perl -pe "s/\bperl\b/Perl/g;" textfile.txt >temptext.txt #### perl -pi.bak -e "s/\bperl\b/Perl/g" infile.txt