1 .\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.47.3.
2 .TH EXPR "1" "January 2016" "GNU coreutils 8.25" "User Commands"
4 expr \- evaluate expressions
12 .\" Add any additional description here
15 display this help and exit
18 output version information and exit
20 Print the value of EXPRESSION to standard output. A blank line below
21 separates increasing precedence groups. EXPRESSION may be:
24 ARG1 if it is neither null nor 0, otherwise ARG2
27 ARG1 if neither argument is null or 0, otherwise 0
30 ARG1 is less than ARG2
33 ARG1 is less than or equal to ARG2
39 ARG1 is unequal to ARG2
42 ARG1 is greater than or equal to ARG2
45 ARG1 is greater than ARG2
48 arithmetic sum of ARG1 and ARG2
51 arithmetic difference of ARG1 and ARG2
54 arithmetic product of ARG1 and ARG2
57 arithmetic quotient of ARG1 divided by ARG2
60 arithmetic remainder of ARG1 divided by ARG2
63 anchored pattern match of REGEXP in STRING
66 same as STRING : REGEXP
68 substr STRING POS LENGTH
69 substring of STRING, POS counted from 1
72 index in STRING where any CHARS is found, or 0
78 interpret TOKEN as a string, even if it is a
80 keyword like 'match' or an operator like '/'
85 Beware that many operators need to be escaped or quoted for shells.
86 Comparisons are arithmetic if both ARGs are numbers, else lexicographical.
87 Pattern matches return the string matched between \e( and \e) or null; if
88 \e( and \e) are not used, they return the number of characters matched or 0.
90 Exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null
91 or 0, 2 if EXPRESSION is syntactically invalid, and 3 if an error occurred.
93 Written by Mike Parker, James Youngman, and Paul Eggert.
95 GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
97 Report expr translation bugs to <http://translationproject.org/team/>
99 Copyright \(co 2016 Free Software Foundation, Inc.
100 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
102 This is free software: you are free to change and redistribute it.
103 There is NO WARRANTY, to the extent permitted by law.
105 Full documentation at: <http://www.gnu.org/software/coreutils/expr>
107 or available locally via: info \(aq(coreutils) expr invocation\(aq