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Not Linux, just shell syntax
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Chris Davies
Chris Davies
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what is the meaning Is Integer in linuxof this shell script function

Can some one tell me what is the meaning of each line with an example , I am not getting why regex is used and even [!0122...] Can some one tell me what is the meaning of each line with an example , I am not getting why regex is used and even [!0122...]

#!/bin/sh
is_integer ()
{
    case "${1#[+-]}" in
        (*[!0123456789]*) return 1 ;;
        ('')              return 1 ;;
        (*)               return 0 ;;
    esac
}

what is the meaning Is Integer in linux

Can some one tell me what is the meaning of each line with an example , I am not getting why regex is used and even [!0122...]

#!/bin/sh
is_integer ()
{
    case "${1#[+-]}" in
        (*[!0123456789]*) return 1 ;;
        ('')              return 1 ;;
        (*)               return 0 ;;
    esac
}

what is the meaning of this shell script function

Can some one tell me what is the meaning of each line with an example , I am not getting why regex is used and even [!0122...]

#!/bin/sh
is_integer ()
{
    case "${1#[+-]}" in
        (*[!0123456789]*) return 1 ;;
        ('')              return 1 ;;
        (*)               return 0 ;;
    esac
}
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disovox
disovox
  • 35
  • 1

what is the meaning Is Integer in linux

Can some one tell me what is the meaning of each line with an example , I am not getting why regex is used and even [!0122...]

#!/bin/sh
is_integer ()
{
    case "${1#[+-]}" in
        (*[!0123456789]*) return 1 ;;
        ('')              return 1 ;;
        (*)               return 0 ;;
    esac
}