Also in square brackets in bash and ksh93 double == are preferred for a string comparison in combination with double brackets..
Numerical comparison:
Arithmetic evaluation:
Or POSIX tests (works in many other shells):
Last edited by Scrutinizer; 02-21-2011 at 07:09 PM..
I am taking an online course on Unix scripting. The topic is Unix arithmetic operators and the lesson is Logical and bitwise operations. It is not clear how much storage space Unix uses to represent integers that are typed. Bitwise negation caused me to question how many bits are used to... (3 Replies)
Guys,
Pl suggest me how to ignore a path in find command... I am aware of using "!" for other option... but how can i use it like this exampl...
I want to search something for in / but not in
Pl help.
Thanks.. (2 Replies)
In my ksh script, if the conditions of a if statement are true, then do nothing; otherwise, execute some commands.
How do I write the "do nothing" statement in the following example?
Example:
if (( "$x"="1" && "$y"="a" && "$z"="happy" ))
then
do nothing
else
command
command
fi... (3 Replies)
I have an "if" statement which checks for certain pattern in the file:
if grep -i dblist.comdbg /bb/bin/rstrt
then
copydb
else
exit 1
fi
How can I use the same statement with negation, checking if file does not exist, something like
if ! grep -i dblist.comdbg /bb/bin/rstrt
then ... (2 Replies)
Hi All,
I am using Unix ksh script.
I need to insert values to a table using the o/p from a slelect statement.
Can anybody Help!
My script looks like tihs.
---`sqlplus -s username/password@SID << EOF
set heading off
set feedback off
set pages 0
insert into ${TB_NAME}_D... (2 Replies)
Is there an option for negation in the "tr" command?
For eg:
echo hi | tr "h" "i"
will print "ii".
But if I want to covert all characters that are not "h" to "j", how do I do that?
Is there something like "!" in tr? Or any switch?
Thanks,
Prasanna (17 Replies)
Hello, have anybody any idea, how to negate some expression?
I have code that greps somethnig and I want filter from it some results...How to make it?
IDontWantThisExpression=$1
grep 'some regex' | grep '$IDontWantThisExpression' testfile.txt
Thanks for any advices.
Faculty of... (2 Replies)
Hi folks,
I have a scenario to convert the update statements into insert statements using shell script (awk, sed...) or in database using regex.
I have a bunch of update statements with all columns in a file which I need to convert into insert statements.
UPDATE TABLE_A SET COL1=1 WHERE... (0 Replies)
Discussion started by: dev123
0 Replies
LEARN ABOUT SUNOS
assert
assert(3C)assert(3C)NAME
assert - verify program assertion
SYNOPSIS
#include <assert.h>
void assert(int expression);
The assert() macro inserts diagnostics into applications. When executed, if expression is FALSE (zero), assert() prints the error message
Assertion failed: expression, file xyz, line nnn
on the standard error output and aborts. In the error message, xyz is the name of the source file and nnn the source line number of the
assert() statement. These are respectively the values of the preprocessor macros __FILE__ and __LINE__.
Since assert() is implemented as a macro, the expression may not contain any string literals.
Compiling with the preprocessor option -DNDEBUG (see cc(1B)), or with the preprocessor control statement #define NDEBUG ahead of the
#include <assert.h> statement, will stop assertions from being compiled into the program.
Messages printed from this function are in the native language specified by the LC_MESSAGES locale category. See setlocale(3C).
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
cc(1B), abort(3C), gettext(3C), setlocale(3C), attributes(5), standards(5)
30 Mar 2005 assert(3C)