1EXPR(1)                          User Commands                         EXPR(1)
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NAME

6       expr - evaluate expressions
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SYNOPSIS

9       expr EXPRESSION
10       expr OPTION
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DESCRIPTION

13       --help display this help and exit
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15       --version
16              output version information and exit
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18       Print  the  value of EXPRESSION to standard output.  A blank line below
19       separates increasing precedence groups.  EXPRESSION may be:
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21       ARG1 | ARG2
22              ARG1 if it is neither null nor 0, otherwise ARG2
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24       ARG1 & ARG2
25              ARG1 if neither argument is null or 0, otherwise 0
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27       ARG1 < ARG2
28              ARG1 is less than ARG2
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30       ARG1 <= ARG2
31              ARG1 is less than or equal to ARG2
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33       ARG1 = ARG2
34              ARG1 is equal to ARG2
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36       ARG1 != ARG2
37              ARG1 is unequal to ARG2
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39       ARG1 >= ARG2
40              ARG1 is greater than or equal to ARG2
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42       ARG1 > ARG2
43              ARG1 is greater than ARG2
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45       ARG1 + ARG2
46              arithmetic sum of ARG1 and ARG2
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48       ARG1 - ARG2
49              arithmetic difference of ARG1 and ARG2
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51       ARG1 * ARG2
52              arithmetic product of ARG1 and ARG2
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54       ARG1 / ARG2
55              arithmetic quotient of ARG1 divided by ARG2
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57       ARG1 % ARG2
58              arithmetic remainder of ARG1 divided by ARG2
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60       STRING : REGEXP
61              anchored pattern match of REGEXP in STRING
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63       match STRING REGEXP
64              same as STRING : REGEXP
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66       substr STRING POS LENGTH
67              substring of STRING, POS counted from 1
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69       index STRING CHARS
70              index in STRING where any CHARS is found, or 0
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72       length STRING
73              length of STRING
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75       + TOKEN
76              interpret TOKEN as a string, even if it is a
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78              keyword like 'match' or an operator like '/'
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80       ( EXPRESSION )
81              value of EXPRESSION
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83       Beware that many operators need to be escaped  or  quoted  for  shells.
84       Comparisons are arithmetic if both ARGs are numbers, else lexicographi‐
85       cal.  Pattern matches return the string matched between \(  and  \)  or
86       null;  if  \( and \) are not used, they return the number of characters
87       matched or 0.
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89       Exit status is 0 if EXPRESSION is neither null nor 0, 1  if  EXPRESSION
90       is  null  or  0,  2 if EXPRESSION is syntactically invalid, and 3 if an
91       error occurred.
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AUTHOR

94       Written by Mike Parker, James Youngman, and Paul Eggert.
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REPORTING BUGS

97       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
98       Report expr translation bugs to <https://translationproject.org/team/>
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101       Copyright © 2018 Free Software Foundation, Inc.   License  GPLv3+:  GNU
102       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
103       This  is  free  software:  you  are free to change and redistribute it.
104       There is NO WARRANTY, to the extent permitted by law.
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SEE ALSO

107       Full documentation at: <https://www.gnu.org/software/coreutils/expr>
108       or available locally via: info '(coreutils) expr invocation'
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112GNU coreutils 8.30                 July 2018                           EXPR(1)
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