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No, the regex equivalent of the second example would be:
grep '^[a-zA-Z][a-zA-Z0-9_-]*$'

Oops, you are right. The OP is using extended pattern matching (like extended globbing). Hadn't even noticed that..
For those testing with bash first execute:
shopt -s extglob
(in recent ksh93...

It is validating the string $answer. It checks whether the string starts with an alphabetic character and that every other character is alphanumeric or a hyphen or an underscore.

To be 100% sure...

Thanks Scruti and ygemici. I got the same error -bash: [: too many arguments as ygemici but after placing the quotes around RHS the error went off. Hence i assumed that we would need to quote the RHS.

@ michael: the double quotes on the RHS of the expression should be removed at any case otherwise the characters will be interpreted as string. Also, the RHS will not be evaluated using regex but by...

check these
if [[ $answer != [a-zA-Z]*[a-zA-Z0-9_-] ]]; then echo ok; fi
ok


from the bash manual it says for [[ expression ]]
Any part of the pattern may be quoted to force it to be matched...

Giving double square brackets is not wrong, the if statement would do the regular test. For more information read link1 (https://www.unix.com/302076732-post.html#post302076732)and link2...

You can add this condition in your default profile file(~/.profile or ~/.kshrc or ~/.cshrc)
Since when the user login profile gets executed.

#!/usr/bin/perl
$|++; #set STDOUT unbuffered; use with caution
print "check 1";
print "check 2";
sleep 5;

#!/usr/bin/perl
print "check 1";
print "check 2\n";
sleep 5;

Yes in some ways they are the same functionality they intend to compress data.
Some do better than others e.g gzip is better than compress and pack in overall .

compress and gzip are alike in...

when you normally execute the above command, it will give the output in terminal

`raidconfig list raid -v`

why do you put echo ?

just put the below in your shell script

`raidconfig...

If the grep comes back empty it means that you are comparing "X" with "X" rather than a blank with a pattern, it's a hang over in my style from shells that fell over if there was an empty string on...

#!/bin/bash
hw_plf_desc=$(grep hw_platform $NODE_CFG_FILE)
if [ "X$(echo $hw_plf_desc | grep 'Netra X4270 X4446A M2')" == "X" ] ; then
echo "Not a Nextra X4270 X4446A M2"
else
echo...

Reference post #5. Did it fail? On the surface the code looks ok.
Just in case you have a weird system, what do you get for:
file /usr/bin/bash

Afterthought. You did create a shell script...

Try: cd /tmp;find . -name "*.log" | xargs -i bash -c "echo {} | cpio -pdmu /tmp/arc; rm -f {}"

Just to add that you'll need to actually go to the target directory:

cd /tmp
find . ! -name . -prune -type fOtherwise you should use something like this:

find /tmp/. ! -name . -prune -type f...

find . ! -name . -prune -type f

With zsh:

print -l -- *(D.)