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Full Discussion: Need help on " if condition" in shell
Top Forums Shell Programming and Scripting Need help on " if condition" in shell Post 302602702 by michaelrozar17 on Tuesday 28th of February 2012 05:25:41 AM
Old 02-28-2012
Giving double square brackets is not wrong, the if statement would do the regular test. For more information read link1 and link2.Coming to the regular expression $answer != [a-zA-Z]*([a-zA-Z0-9_-]) on splitting it
Code:
[a-zA-Z]*     --> Matches 0 or more alphabets both upper and lower case. According to the input given this matches first two letters SK in SK_BTS04A_hiQ_01b
(             --> literal open brace match
[a-zA-Z0-9_-] --> Match 0 or 1 alphabets both lower and upper case,numbers from 0 to 9, underscore and a hyphen
)             --> literal close brace match

Since it matches only first 2 letters the output would be 1. Additionally having double quotes around variables and literals while comparing is a good way to program.
Code:
#!/bin/ksh
answer=SK_BTS04A_hiQ_01b
if [[ "$answer" != "[a-zA-Z]*([a-zA-Z0-9_-])" ]]
then
        echo 1
else
        echo 2
fi

These 2 Users Gave Thanks to michaelrozar17 For This Post:
daWonderer frintocf
 

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LEARN ABOUT CENTOS

grub-render-label

GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME

       grub-render-label - generate a .disk_label for Apple Macs.

SYNOPSIS

       grub-render-label [OPTION...] [OPTIONS]

DESCRIPTION

       Render Apple .disk_label.

       -b, --bgcolor=COLOR
              use COLOR for background

       -c, --color=COLOR
              use COLOR for text

       -f, --font=FILE
              use FILE as font (PF2).

       -i, --input=FILE
              read text from FILE.

       -o, --output=FILE
              set output filename. Default is STDOUT

       -t, --text=STRING
              set the label to render

       -v, --verbose
              print verbose messages.

       -?, --help
              give this help list

       --usage
              give a short usage message

       -V, --version
              print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

REPORTING BUGS

       Report bugs to <bug-grub@gnu.org>.

SEE ALSO

       The  full  documentation  for grub-render-label is maintained as a Texinfo manual.  If the info and grub-render-label programs are properly
       installed at your site, the command

              info grub-render-label

       should give you access to the complete manual.

grub-render-label (GRUB) 2.02-2ubuntu8.3                             July 2018                                                GRUB-RENDER-LABEL(1)
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