z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

expr
Option
Usage Note
Examples
Localization
Exit Values
expr does not consider ^ to be a metacharacter. If the regular expression
contains \(...\), \) and it matches at least part of expr1, expr results in only
that part; if there is no match, expr results in 0. If the regular expression
doesn’t contain this construct, the result is the number of characters
matched. The function match performs the same operation as the colon
operator.
substr expr1 expr2 expr3
Results in the substring of expr1 starting at position expr2 (origin 1) for the
length of expr3.
index expr1 expr2
Searches for any of the characters in expr2 in expr1 and results in the
offset of any such character (origin 1), or 0 if no such characters are found.
length expr1
Results in the length of expr1.
(expr) Groups expressions.
–W Allows the expression to use hex and octal numbers.
The parser stack depth is limited to 150 levels. Attempting to process extremely
complicated expressions may result in an overflow of this stack, causing an error.
1. The example
fname=src/fn_abs.c
expr $fname : ’*_\(.*\)\.c’
returns abs.
2. The example
a=`expr $a + 1`
adds 1 to the value of the shell variable a.
expr uses the following localization environment variables:
v LANG
v LC_ALL
v LC_COLLATE
v LC_CTYPE
v LC_MESSAGES
v LC_SYNTAX
v NLSPATH
See Appendix F for more information.
0 The result of expression is true.
1 The result of expression is false.
2 Failure due to any of following:
v Not enough memory.
266 z/OS V1R9.0 UNIX System Services Command Reference