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I'd do
#!/usr/bin/env bash die () { echo "$*" >&2; exit 1; } input=$1 [[ $input == +([[:digit:]]) ]] || die "only digits please" (( input <= 9999 )) || die "fewer"no more than 4 digits please" echo "ok: $input"
#!/usr/bin/env bash die () { echo "$*" >&2; exit 1; } input=$1 [[ $input == +([[:digit:]]) ]] || die "only digits please" (( input <= 9999 )) || die "fewer than 4 digits please" echo "ok: $input"
#!/usr/bin/env bash die () { echo "$*" >&2; exit 1; } input=$1 [[ $input == +([[:digit:]]) ]] || die "only digits please" (( input <= 9999 )) || die "no more than 4 digits please" echo "ok: $input"
#!/usr/bin/env bash die () { echo "$*" >&2; exit 1; } input=$1 [[ $input == +([[:digit:]]) ]] || die "only digits please" [(( ${#input}input -le<= 49999 ])) || die "need up"fewer tothan 4 digits please" echo "ok: $input"
#!/usr/bin/env bash die () { echo "$*" >&2; exit 1; } input=$1 [[ $input == +([[:digit:]]) ]] || die "only digits please" [ ${#input} -le 4 ] || die "need up to 4 digits please" echo "ok: $input"
#!/usr/bin/env bash die () { echo "$*" >&2; exit 1; } input=$1 [[ $input == +([[:digit:]]) ]] || die "only digits please" [ ${#input} -eqle 4 ] || die "need up to 4 digits please" echo "ok: $input"
#!/usr/bin/env bash die () { echo "$*" >&2; exit 1; } input=$1 [[ $input == +([[:digit:]]) ]] || die "only digits please" [ ${#input} -eq 4 ] || die "need 4 digits please" echo "ok: $input"
