grep: force sh to be used for fzf preview command #5
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Fixes kks-grep preview on non POSIX shells (Fish) $SHELL variable is usually set to users preferred shell [1]. If set, FZF uses the variable to run preview command. kks-grep preview command requires POSIX compatible shell. [1]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_03
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Fixes kks-grep preview on non POSIX shells (Fish)
$SHELLvariable is usually set to users preferred shell 1. If set,FZF uses the variable to run preview command.
kks-greppreview commandrequires POSIX compatible shell.