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Hi.

Similarly, given file data1:
abc
def
ghi
jkl
and perl code p1:
#!/usr/bin/env perl

# @(#) p1 Demonstrate slurp and single-string match.

use strict;
use warnings;

my $a =...

perl -pe operates on a line-by-line basis, so it will not match a multiline pattern
You could try something like (within a paragraph):
perl -00 -pe 's/a.*f/z/s' file
or (within a file)
perl -0777...

Hi, try:
sort -bt. -k1,1 -k2,2n -k3,3n -k4,4n -k5,5n

I think it's at assignment:

$ T=$(printf "A\x0B")
$ echo ${#T}
2

$ T=$(echo "AAA" | sed "s:A:\x0:"g)
$ echo ${#T}
0

I suspect bash uses the standard C string functions to deal with...

There's a neat little trick the shell allows you to use. Compare these 2 runs:
$ var=foo
$ cat << EOF
> echo $var
> EOF
echo foo
$ cat << 'EOF'
> echo $var
> EOF
echo $var

Check the << bit of your bash man pages.
If you quote any part of the here document terminator it disables parameter substitution within the here document:
cat > child.sh << \EOF



The other...

No math needed:


foo="hello world"
echo ${foo%?}
hello worl

Corona688's answer is pretty right, but don't forget to chomp!
chomp removes the newline character from the end of line.
chomp($LINE);
the line input operator includes the newline at the
end of...

You read input from stdin by using the special STDIN file descriptor.

print "Type something and hit enter: ";
$LINE=<STDIN>;

$
$ # display the data file
$ cat -n data_file
1 this is line 1
2 this is line 2
3 i want to substitute this => ~ <= by that => # <=
4 at multiple places => abc~ def~ghi...

Are you okay with removing the "p" switch?
It's similar to the "n" switch, but it prints the input line by default (similar in function to the "p" switch of sed).

For example, if your shell...

$
$ # Bash command
$ cat testfile
this is a test file
$
$
$ # Perl program
$ cat -n call_bash.pl
1 #!/usr/bin/perl -w
2 # Call Bash command
3 system ("cat testfile");
$...

-a and -o are deprecated... For POSIX compliancy use:

if test 1 -eq 1 && ( test 2 -eq 2 || test 3 -eq 3 )
then
echo "true"
else
echo "false"
fi

or the synonym:
if [ 1 -eq 1 ] && ( [ 2...

As you can tell LessNux we are very concerned with the security implications of using eval against user entered data. There are a few limited situations where using eval could be OK but in general...