As gus2000 noted, you can do this in some shells. In most systems, expr also has some limited string matching:
Producing:
See man pages for details ... cheers, drl
Hi,
Is there any unix equivalents available for the folllowing windows function ?
FindFirstFile
FindNextFile etc.....
Or do i have to write an equivalent api??
Can anybody help me to do the same??
thanks in advance
Ani (2 Replies)
i was trying to do a simple batch file equivalent in Unix
when i write a single command in a file, give executable permissions and run it (i gave the file name as a command at the prompt), it works fine.
but when i have more than 1 command, say my file has
a.out
ls
ls
a.out
it doesnt... (1 Reply)
Hi all,
I am preparing for a worst case scenario. Say i have a production server A, should A fails ( for whatever reason), i want another server B to take over. How can i move everything from A to B? Assuming i have regular backup of A.
I've searched in the forums, and briefly came across... (4 Replies)
Hi all,
Is there any command in unix equivalent to setlocal in windows.
setlocal command is really useful in restoring local environment variables in windows.
Thanks,
Sonal. (7 Replies)
Hi All,
I am a frequent user of loacate in linux and really impressed with its speed and accuracy.
I would like to know if there is any such equivalent in UNIX. (not the find, which is relatively very slow)
Any locate packages which can be made available in UNIX(HP-UX) for this?
TIA,... (4 Replies)
Hi All,
I am comfortable working in LINUX and need equivalents for HP-UX for below mentioned,
1. We use TAB key to expand/reveal a name in LINUX. Is there any way to make this work for UNIX, where it is double escape.
2. Also can we use make use of left,down,up,right keys instead... (3 Replies)
I have a folder called "log" which has a few sub-folders say "fda" "fd7" "fdd" "fd6 .... "
I wish to fire the below command inside each subfolder starting with the folder with the latest time stamp.
grep "$greptime.*exit" Prod.$(hostname).log | grep $fdrdate_new
If the seach did not yield... (3 Replies)
Discussion started by: mohtashims
3 Replies
LEARN ABOUT V7
expr
EXPR(1) General Commands Manual EXPR(1)NAME
expr - evaluate arguments as an expression
SYNOPSIS
expr arg ...
DESCRIPTION
The arguments are taken as an expression. After evaluation, the result is written on the standard output. Each token of the expression is
a separate argument.
The operators and keywords are listed below. The list is in order of increasing precedence, with equal precedence operators grouped.
expr | expr
yields the first expr if it is neither null nor `0', otherwise yields the second expr.
expr & expr
yields the first expr if neither expr is null or `0', otherwise yields `0'.
expr relop expr
where relop is one of < <= = != >= >, yields `1' if the indicated comparison is true, `0' if false. The comparison is numeric if
both expr are integers, otherwise lexicographic.
expr + expr
expr - expr
addition or subtraction of the arguments.
expr * expr
expr / expr
expr % expr
multiplication, division, or remainder of the arguments.
expr : expr
The matching operator compares the string first argument with the regular expression second argument; regular expression syntax is
the same as that of ed(1). The (...) pattern symbols can be used to select a portion of the first argument. Otherwise, the
matching operator yields the number of characters matched (`0' on failure).
( expr )
parentheses for grouping.
Examples:
To add 1 to the Shell variable a:
a=`expr $a + 1`
To find the filename part (least significant part) of the pathname stored in variable a, which may or may not contain `/':
expr $a : '.*/(.*)' '|' $a
Note the quoted Shell metacharacters.
SEE ALSO ed(1), sh(1), test(1)DIAGNOSTICS
Expr returns the following exit codes:
0 if the expression is neither null nor `0',
1 if the expression is null or `0',
2 for invalid expressions.
EXPR(1)