There needs to be spaces between everything in expr. 3 -12 is invalid, 3 - 12 is okay.
That aside your script can be made a lot better in other ways. You don't need to be doing cut all the time to do simple string processing, that's really slow and difficult.
I am looking for the correct syntax on the expr command in UNIX. I have a script that I am building at the moment. the script is creating file1 that is an actual .sql file that is going inside the oracle database to get some information in there. It take that information, puts it inside another... (2 Replies)
Hello,
How do i translate datevalues in unix to normal dates.
and how do i translate normal dates in to datevalues.
I'm using the unix-date.
Sample:
1067949360 to 4-11-03 12:36
and
4-11-03 12:36 to 1067949360
I want to built a script with a question to the user: give in date... (4 Replies)
Hi I need to subtract one day from date1=`/bin/date +%d`
So I used
date=`/usr/ucb/expr $date1 - 1`
The only thing is if date1 is a single digit like 08, date will be 8 instead of 08.
How can I avoid losing 0?
Thanks for all your help!!! (4 Replies)
hi guys....
i hava a command expr... where i m adding a value in a loop
like
Tc=`expr $Tc\+ $l`
where
Tc is declred as a variable and every time l contains a new vaue
if
Tc =0 initially
and l =2
Tc should be equal to 0+ 2
and then
l = 4
Tc = 2+4
and dispaly as 6
but after... (5 Replies)
Hello,
what can I do to convert a decimal number (001-366) into the day of the year it represent in the format of mm-dd-yyyy ?
I know about the date +%j, it gives me the number for the current date, what about a reverse of this, is there such a thing?
My number resides in a var, what can I do to... (3 Replies)
Hi
Can anyone explain me the usage of this command and the arguments used here and what will be the expected output :
v_num=`expr nav_d_20100204_1759 : '*\(*\)'`
what will be the value returned in v_num.
Thanks in Advance!!!
Regards
Naveen Purbia (3 Replies)
I'm trying to check if a variable'd string is only one character and use that in an if statement the only way I could find is:
$expr "${var}" : . # expr STRING : regrep
where the "." is the grep wildcard for any single character.
Whats wrong with my code here and is there a... (3 Replies)
I am trying to read a txt file and trying to translate multiples spaces into single spaces so the file is more organized, but whenever I try the command:
tr ' ' ' ' w.txt
The output is:
tr: extra operand `w.txt'
Try `tr --help' for more information.
Can someone please help? :wall:
... (2 Replies)
Hello,
I have an input file contaning following data:
< 12345;5454;77;qwert< yuyuy;ruwuriwru> yyyw;
> 35353;68686;424242;hrjwhrwrwy< dgdgd;
I have first character as '<' or '>'and after that one space is their in each line
I just want to replace 1st space encountered after < or >... (3 Replies)
Discussion started by: abhi001cse
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)