CODEWITHSUNDEEP
bash
user2093607
user2093607

Reputation: 45

Validating filename in Bash

I want to validate a file name in bash to make sure that I don't have this '[]' character in it

I have this :

if ! [[ $filename=~ ^[a-zA-Z]+$ ]]; then
    echo 'Wrong filename input' >&2 
    exit 1
fi

but I want explicitly avoid [] and allow other special characters.

any advice?

Thanks.

Upvotes: 0

Views: 1052

Answers (1)

anubhava
anubhava

Reputation: 785651

Use spaces around =~ operator:

[[ ! "$filename" =~ ^[a-zA-Z]+$ ]] && echo "bad filename" || echo "its good"

OR your own script:

if [[ ! "$filename" =~ ^[a-zA-Z]+$ ]]; then
    echo 'Wrong filename input' >&2 
    exit 1
fi

Update:

If you want to explicitly avoid only [ and ] then following check is better:

if [[ "$filename" == *[]\[]* ]]; then
    echo 'Wrong filename input' >&2 
    exit 1
fi

Upvotes: 5

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