expr(1)

💖 expr(1) — the general commands manual glow-up 💖

okay bestie, welcome to expr(1), a page from the General Commands Manual that's about to become your whole personality. she prints the value of an expression to standard output, and honestly? iconic behaviour. 🎀

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✨ NAME ✨

expr — Print the value of EXPRESSION to standard output. that's it. that's the job. 💅

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🌸 SYNOPSIS 🌸

expr [--version] [--help] [expression]

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🦋 DESCRIPTION 🦋

Print the value of EXPRESSION to standard output. literally, that's what she does. no cap. 🫶

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👑 OPTIONS 👑

• --version — output version information and exit. bye girl, she's leaving to tell you her version 💜
• --help — display this help and exit. she's helping!! she's so helpful!! 🧚
• [expression] — the expression, optional bracket situation, slay 💖

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🌈 EXTRA 🌈

Print the value of EXPRESSION to standard output. A blank line below separates increasing precedence groups. (iykyk — the groups stack up in priority, and the blank line is the little vibe check between them ✨)

EXPRESSION may be:

• ARG1 | ARG2: ARG1 if it is neither null nor 0, otherwise ARG2
• ARG1 & ARG2: ARG1 if neither argument is null or 0, otherwise 0
• ARG1 < ARG2: ARG1 is less than ARG2
• ARG1 <= ARG2: ARG1 is less than or equal to ARG2
• ARG1 = ARG2: ARG1 is equal to ARG2
• ARG1 != ARG2: ARG1 is unequal to ARG2
• ARG1 >= ARG2: ARG1 is greater than or equal to ARG2
• ARG1 > ARG2: ARG1 is greater than ARG2
• ARG1 + ARG2: arithmetic sum of ARG1 and ARG2
• ARG1 - ARG2: arithmetic difference of ARG1 and ARG2
• ARG1 * ARG2: arithmetic product of ARG1 and ARG2
• ARG1 / ARG2: arithmetic quotient of ARG1 divided by ARG2
• ARG1 % ARG2: arithmetic remainder of ARG1 divided by ARG2
• STRING : REGEXP: anchored pattern match of REGEXP in STRING
• match STRING REGEXP: same as STRING : REGEXP
• substr STRING POS LENGTH: substring of STRING, POS counted from 1
• index STRING CHARS: index in STRING where any CHARS is found, or 0
• length STRING: length of STRING
• + TOKEN: interpret TOKEN as a string, even if it is a keyword like match or an operator like /
• ( EXPRESSION ): value of EXPRESSION

bestie, listen: Beware that many operators need to be escaped or quoted for shells. this is not a drill, this is the shell's whole deal 😭

Comparisons are arithmetic if both ARGs are numbers, else lexicographical. Pattern matches return the string matched between \( and \) or null; if \( and \) are not used, they return the number of characters matched or 0.

Exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null or 0, 2 if EXPRESSION is syntactically invalid, and 3 if an error occurred. she's got ✨range✨ fr fr 🔥

Environment variables:

• EXPR_DEBUG_TOKENS=1: dump expression's tokens
• EXPR_DEBUG_RPN=1: dump expression represented in reverse polish notation
• EXPR_DEBUG_SYA_STEP=1: dump each parser step
• EXPR_DEBUG_AST=1: dump expression represented abstract syntax tree

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💜 VERSION 💜

v(uutils coreutils) 0.7.0

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mwah 💋 that's the whole page, and honestly? she ate. this was expr from uutils coreutils, version 0.7.0, straight out of the General Commands Manual — go forth and print some expressions, main character 🎀🦋💖