[SOLVED] How To Break Up Long Statement In Bash Script?

thriftyb · 2015-04-02 21:43:26

Hello Everyone,

If have the following If statement in a script:

if [[ $1 =~ ^[A-Fa-f0-9]{4,4}\:[A-Fa-f0-9]{4,4}\:[A-Fa-f0-9]{4,4}\:[A-Fa-f0-9]{4,4}\:[A-Fa-f0-9]{4,4}\:[A-Fa-f0-9]{4,4}\:[A-Fa-f0-9]{4,4}\:[A-Fa-f0-9]{4,4}$ ]]; then

Is there any way to break this statement into multiple lines? I tried entering a \ after a portion of the statement and then pressing Enter to add a newline but it did not work.

thriftyb

Last edited by thriftyb (2015-04-03 21:44:13)

Alad · 2015-04-02 21:45:05

WTF. Use grep -P or something. Or better, tell us what you're trying to do.

http://mywiki.wooledge.org/XyProblem

nullified · 2015-04-02 21:51:57

The backslashes should work: http://stackoverflow.com/questions/1859 … -statement

as the answer points out, make sure you have no whitespace after the backslash.

Raynman · 2015-04-02 22:05:26

You could at least do

if [[ $1 =~ ^([A-Fa-f0-9]{4,4}\:){7,7}[A-Fa-f0-9]{4,4}$ ]]; then

and then maybe put the duplicate pattern in a variable with a descriptive name:

hextet="[A-Fa-f0-9]{4,4}"
if [[ $1 =~ ^($hextet\:){7,7}$hextet$ ]]; then

thriftyb · 2015-04-02 22:44:44

@Alad: This statement tests for a valid IPv6, testing each part of the entered address to make sure it is a group of four hexadecimal digits with each group being separated by a colon.

@Rayman: Cool, I think that your method will work.

thriftyb

Alad · 2015-04-02 23:56:24

if grep -xP '(([A-Fa-f0-9]{4}):){7}(?2)' <<< "$1"; then

http://www.regular-expressions.info/subroutine.html

Last edited by Alad (2015-04-03 00:01:49)

thriftyb · 2015-04-03 03:32:11

Alad wrote:

if grep -xP '(([A-Fa-f0-9]{4}):){7}(?2)' <<< "$1"; then
http://www.regular-expressions.info/subroutine.html

That works too. I didn't know that grep could be used that way. Thanks.

fsckd · 2015-04-03 12:35:05

That's what grep is for. Think what one would do in an old shell which has no builtin regex operator.

Arch Linux

#1 2015-04-02 21:43:26

[SOLVED] How To Break Up Long Statement In Bash Script?

#2 2015-04-02 21:45:05

Re: [SOLVED] How To Break Up Long Statement In Bash Script?

#3 2015-04-02 21:51:57

Re: [SOLVED] How To Break Up Long Statement In Bash Script?

#4 2015-04-02 22:05:26

Re: [SOLVED] How To Break Up Long Statement In Bash Script?

#5 2015-04-02 22:44:44

Re: [SOLVED] How To Break Up Long Statement In Bash Script?

#6 2015-04-02 23:56:24

Re: [SOLVED] How To Break Up Long Statement In Bash Script?

#7 2015-04-03 03:32:11

Re: [SOLVED] How To Break Up Long Statement In Bash Script?

#8 2015-04-03 12:35:05

Re: [SOLVED] How To Break Up Long Statement In Bash Script?

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