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Home > Archive > Unix Shell > November 2006 > substring using ksh
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substring using ksh
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| In a ksh 88 script , I want to test a variable to see if its value contains
a certain substring. Can this be done with grep? If so, does anyone have an
example?
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| Chris F.A. Johnson 2006-11-27, 1:29 am |
| On 2006-11-27, Tim B wrote:
> In a ksh 88 script , I want to test a variable to see if its value contains
> a certain substring. Can this be done with grep? If so, does anyone have an
> example?
You don't need grep, or any other external command. The following
checks whether $substring is contained in $string in all
Bourne-type shells (sh, ksh, bash, ash, ...):
case $string in
*"$substring"*) echo Contains ;;
*) echo Does not contain ;;
esac
--
Chris F.A. Johnson, author <http://cfaj.freeshell.org/shell>
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
===== My code in this post, if any, assumes the POSIX locale
===== and is released under the GNU General Public Licence
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| Dan Mercer 2006-11-27, 7:23 pm |
| Use a conditional expression:
if [[ $string = *somesubstring* ]]; then
Extended globbing adds enormous power to the search.
More portably, use case:
case $string in
*somesubstring*) do_something;;
esac
Dan Mercer
"Tim B" <nospam@someisp.ca> wrote in message news:k_uah.380298$5R2.229395@pd7urf3no...
: In a ksh 88 script , I want to test a variable to see if its value contains
: a certain substring. Can this be done with grep? If so, does anyone have an
: example?
:
:
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"Dan Mercer" <damercer@comcast.net> wrote in message
news:U9CdnbY2Xa2f5fbYnZ2dnUVZ_tSdnZ2d@co
mcast.com...
> Use a conditional expression:
>
> if [[ $string = *somesubstring* ]]; then
>
> Extended globbing adds enormous power to the search.
>
> More portably, use case:
>
> case $string in
> *somesubstring*) do_something;;
> esac
>
> Dan Mercer
>
> "Tim B" <nospam@someisp.ca> wrote in message
news:k_uah.380298$5R2.229395@pd7urf3no...
> : In a ksh 88 script , I want to test a variable to see if its value
contains
> : a certain substring. Can this be done with grep? If so, does anyone have
an
> : example?
> :
Thanks for the replies, Chris and Dan
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