expr

Options

--version

expr-help-version

--help

expr-help-help

Examples

Get the length of a specific string:

expr length "{{string}}"

Get the substring of a string with a specific length:

expr substr "{{string}}" {{from}} {{length}}

Match a specific substring against an anchored pattern:

expr match "{{string}}" '{{pattern}}'

Get the first char position from a specific set in a string:

expr index "{{string}}" "{{chars}}"

Calculate a specific mathematic expression:

expr {{expression1}} {{+|-|*|/|%}} {{expression2}}

Get the first expression if its value is non-zero and not null otherwise get the second one:

expr {{expression1}} \| {{expression2}}

Get the first expression if both expressions are non-zero and not null otherwise get zero:

expr {{expression1}} \& {{expression2}}

The examples are provided by the tldr-pages project under the CC BY 4.0 License.

Please note that, as uutils is a work in progress, some examples might fail.