unixfile / dosfile, eof line char ?
/bin/sh ? Some other sh, not BourneSh. It's more safety to use
ksh, bash, dash, zsh, then you know exactly which shell you are using.
Ex. case 1 is correct.
If your file numbers is empty, in first time, n is not number = expr not like so much and it is null = not enough arguments.
expr "$variable" + 1 is better than expr $variable + 1.
All,
I have a shell script which parses the /var/adm/messages file for errors every 15 minutes as a cron job. The script runs at 01, 16, 31, and 46 minutes every hour. The problem is if the error is encountered any time during the beginning of hour I can get paged three times. I would like to... (2 Replies)
Hello, I was hoping for a second pair of eyes or a little bit of help figuring out what my error is in a script. I did some searching in the forums and didn't find anything so please forgive me if it a similar problem has been discussed before.
My script accepts normal user arguments; however,... (2 Replies)
Hi,
I have a bash script which calls a few "make". I would like to know whether the makefile failed with any errors. How do I do that in the script?
Thanks,
S (2 Replies)
I want to delete archivelog files that has been archived and applied from primary database
to standby database. This piece of script is working in Linux server. However, I copy it to
Unix server with tiny modification. It won't work and generate the error message. I have checked
code carefullt... (8 Replies)
So I have a script that does a greater than or less than with a variable. My problem is that when I checked the script from the command line I was getting this error..
I am not really familiar with shell scripting. I am trying to get this script to work with conky so that it will do the... (8 Replies)
The script below fails with the following error messages:
gzip: invalid option -- 'w'
Try `gzip --help' for more information.
mysqldump: Got errno 32 on write
cp: invalid option -- 'w'
Try `cp --help' for more information.
rm: invalid option -- 'w'
Try `rm --help' for more information.
... (1 Reply)
Hi All,
I am calling a series of shell scripts via CRON so everything is running as root. However, in my error log file I am seeing the following errors. Please can anyone offer any advise as to the possible causes and solution to prevent the errors from appearing.
The Error 1227 seems to... (2 Replies)
I have a shell script which select total count from a table and use its value in a if condition like below
connect_string="username/password@tnsname"
tot=`sqlplus -s $connect_string << EOF
set echo off
set feedback off
set head off
select count(*) from test_table;
EOF
`
if
then
echo... (2 Replies)
Hello All,
i am facing difficulty in validating the values,
kindly help me in resolving the issue.
Thanks a lot in advance.
-Chandra
Script:Test.sh
#! /bin/sh
# ***************************************************************************
# Function to display help
function usage()... (1 Reply)
Discussion started by: duddukuri
1 Replies
LEARN ABOUT BSD
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 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.
7th Edition April 29, 1985 EXPR(1)