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shell check value length

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DreamCoder answered on January 14, 2022 Popularity 1/10 Helpfulness 1/10

answer shell check value length

related bash check length of variable

related shell check value length

shell check value length

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if [[ -v var ]]; then             # var is set but it could be empty
if [[ ! -v var ]]; then           # var is not set
if [[ -v var && ! $var ]]; then   # var is set and is empty
if [[ -v var && -z $var ]]; then  # var is set and is empty

Popularity 1/10 Helpfulness 1/10 Language shell

Source: stackoverflow.com

Tags: shell

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Contributed on Apr 27 2023

DreamCoder

0 Answers Avg Quality 2/10

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bash check length of variable

Comment

myvar="some string"
size=${#myvar}

Popularity 8/10 Helpfulness 5/10 Language shell

Source: stackoverflow.com

Tags: shell bash s

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Contributed on Jan 14 2022

Helpful Hawk

0 Answers Avg Quality 2/10

shell check value length

Comment

#!/bin/bash
read string
if [ ${#string} -ge 5 ]; then echo "error" ; exit
else echo "done"
fi

And if you have no problem on trading more elegance in favor of being shorter, you can have a script with 2 lines less:

#!/bin/bash
read string
[ ${#string} -ge 5 ] && echo "error" || echo "done"

Popularity 1/10 Helpfulness 1/10 Language shell

Source: unix.stackexchange.com

Tags: shell

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Contributed on Apr 27 2023

DreamCoder

0 Answers Avg Quality 2/10

shell check value length

Comment

if [[ $var ]]; then   # var is set and it is not empty
if [[ ! $var ]]; then # var is not set or it is set to an empty string

Popularity 1/10 Helpfulness 1/10 Language shell

Source: stackoverflow.com

Tags: shell

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Contributed on Apr 27 2023

DreamCoder

0 Answers Avg Quality 2/10

shell check value length

Comment

if [[ ${var+x} ]]; then           # var is set but it could be empty
if [[ ! ${var+x} ]]; then         # var is not set
if [[ ${var+x} && ! $var ]]; then # var is set and is empty

Popularity 1/10 Helpfulness 1/10 Language shell

Source: stackoverflow.com

Tags: shell

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Contributed on Apr 27 2023

DreamCoder

0 Answers Avg Quality 2/10

shell check value length

Comment

True if string is not empty:

[ -n "$var" ]
[[ -n $var ]]
test -n "$var"
[ "$var" ]
[[ $var ]]
(( ${#var} ))
let ${#var}
test "$var"

True if string is empty:

[ -z "$var" ]
[[ -z $var ]]
test -z "$var"
! [ "$var" ]
! [[ $var ]]
! (( ${#var} ))
! let ${#var}
! test "$var"

Popularity 1/10 Helpfulness 1/10 Language shell

Source: stackoverflow.com

Tags: shell

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Contributed on Apr 27 2023

DreamCoder

0 Answers Avg Quality 2/10

shell check value length

Comment

test "$1"
test ! "$1"

test -n "$1"
test -z "$1"

Popularity 1/10 Helpfulness 1/10 Language shell

Source: stackoverflow.com

Tags: shell

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Contributed on Apr 27 2023

DreamCoder

0 Answers Avg Quality 2/10

shell check value length

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shell check value length

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bash check length of variable

shell check value length

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shell check value length

shell check value length

shell check value length

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