01-23-2004
The brackets seems to be properly surrounded by whitespace. But the equals sign is not. This is legal:
[ "$string" ]
and it test whether or not string is null. If effect that what is being tested in this code.
Even when the spaces are added, the code will fail is $1 is null. There must be three things inside the brackets.
"$1" would solve that.
Late again...
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I'm using the following in my script.
if echo $cpuidle |/usr/bin/egrep ; then
when I issue this statement it issues the value of the variable back to stdout which ends up in my output file.
Is there a better way to write this?
I'm using ksh on solaris 9. (3 Replies)
Discussion started by: MizzGail
3 Replies
2. Shell Programming and Scripting
I'm trying to create a directory from my Perl script. Only if the there was an error I want to let the user know about it. So if the folder exists is ok.
This is what I think should work:
`mkdir log 2>/dev/null`;
if($? == 0 || $? == errorCodeForFileExists)
{ everyting is fine }
else
{... (3 Replies)
Discussion started by: jepombar
3 Replies
3. UNIX for Dummies Questions & Answers
Hi,
I will pass 3 parameters for a script.I have to check the file name and create a new file name with time stamp.
the parameters which i'm passing are
/dir/stg/filename.txt
/dir/path/head.txt
/dir/path/tail.txt
Now i have to check filename like :
if it is a.txt i have to create... (2 Replies)
Discussion started by: ammu
2 Replies
4. Shell Programming and Scripting
hi
i have a file, i am reading line by line and checking a line contains a string ,
`grep "Change state" $LINE`
if
then
echo "The line contains---"
else
echo "The line does not contains---"
i need to check the return code , but i am getting an error
... (4 Replies)
Discussion started by: Satyak
4 Replies
5. Shell Programming and Scripting
Hi I am new to shell scripting and trying to get values from a text file,
I have a text file with values seperated with "|". like
aga|120220090525|120220090525|120220090525|120220090530
bab|120220090530|120220090530|120220090535|120220090535|120220090535... (4 Replies)
Discussion started by: mannepalli
4 Replies
6. Shell Programming and Scripting
Today I spent longer than I'd like to admit figuring out how to write a Bourne shell IF statement that tests a FLOAT value before executing a block of statements. Here's the solution I found, which invokes bc. Hope this will come in handy for someone:
value =
testval =
if
then
body... (5 Replies)
Discussion started by: sjepsen
5 Replies
7. Shell Programming and Scripting
Hi All,
I have a file that has ~2.9Millions lines with 32 columns respectively.
The columns numbers 23,27 are the primary Keys for the file.
The fields are delimited by TAB.
I need to check the condition If
Column number: 20 is NOT NULL
Column number: 21 is not 0
Column number: 22 is... (7 Replies)
Discussion started by: filter
7 Replies
8. Shell Programming and Scripting
i was just wondering how would you check , beside the lock method, if an instance of another code is already running and if it is then output a message to the user saying the program is already running and exit!! the code is in BOURNE SHELLL!!!
thanks in advance!! (3 Replies)
Discussion started by: bshell_1214
3 Replies
9. Shell Programming and Scripting
I have a short line of code that checks very rudimentary for duplicate code:
sort myfile.cpp | uniq -c | grep -v "^.*1 " | grep -v "}"
It sorts the file, counts occurrences of each line, removes single occurrences and removes the ubiquitous closing brace. The language is C++, but is easily... (3 Replies)
Discussion started by: figaro
3 Replies
10. Shell Programming and Scripting
I'm in the process of writng a function that consists of a case statement is there a way of calling the function and passing a value to it?
ie
function1 () {
case
opt1 do .....
opt2 do.....
esac
}
function opt1
I'm aware the syntax is not correct, but you get the general idea. (1 Reply)
Discussion started by: squrcles
1 Replies
LEARN ABOUT OPENSOLARIS
test
test(1B) SunOS/BSD Compatibility Package Commands test(1B)
NAME
test - condition evaluation command
SYNOPSIS
/usr/ucb/test expression
expression
DESCRIPTION
test evaluates the expression expression and, if its value is true, sets 0 (true) exit status; otherwise, a non-zero (false) exit status
is set. test also sets a non-zero exit status if there are no arguments. When permissions are tested, the effective user ID of the process
is used.
All operators, flags, and brackets (brackets used as shown in the second SYNOPSIS line) must be separate arguments to the test command;
normally these items are separated by spaces.
USAGE
Primitives
The following primitives are used to construct expression:
-r filename True if filename exists and is readable.
-w filename True if filename exists and is writable.
-x filename True if filename exists and is executable.
-f filename True if filename exists and is a regular file. Alternatively, if /usr/bin/sh users specify /usr/ucb before /usr/bin in
their PATH environment variable, then test will return true if filename exists and is (not-a-directory). This is also the
default for /usr/bin/csh users.
-d filename True if filename exists and is a directory.
-c filename True if filename exists and is a character special file.
-b filename True if filename exists and is a block special file.
-p filename True if filename exists and is a named pipe (fifo).
-u filename True if filename exists and its set-user- ID bit is set.
-g filename True if filename exists and its set-group- ID bit is set.
-k filename True if filename exists and its sticky bit is set.
-s filename True if filename exists and has a size greater than zero.
-t[ fildes ] True if the open file whose file descriptor number is fildes (1 by default) is associated with a terminal device.
-z s1 True if the length of string s1 is zero.
-n s1 True if the length of the string s1 is non-zero.
s1 = s2 True if strings s1 and s2 are identical.
s1 != s2 True if strings s1 and s2 are not identical.
s1 True if s1 is not the null string.
n1 -eq n2 True if the integers n1 and n2 are algebraically equal. Any of the comparisons -ne, -gt, -ge, -lt, and -le may be used in
place of -eq.
Operators
These primaries may be combined with the following operators:
! Unary negation operator.
-a Binary and operator.
-o Binary or operator (-a has higher precedence than -o).
(expression) Parentheses for grouping. Notice also that parentheses are meaningful to the shell and, therefore, must be quoted.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
find(1), sh(1), attributes(5)
NOTES
The not-a-directory alternative to the -f option is a transition aid for BSD applications and may not be supported in future releases.
If you test a file you own (the -r , -w , or -x tests), but the permission tested does not have the owner bit set, a non-zero (false) exit
status will be returned even though the file may have the group or other bit set for that permission. The correct exit status will be set
if you are super-user.
The = and != operators have a higher precedence than the -r through -n operators, and = and != always expect arguments; therefore, = and !=
cannot be used with the -r through -n operators.
If more than one argument follows the -r through -n operators, only the first argument is examined; the others are ignored, unless a -a or
a -o is the second argument.
SunOS 5.11 1 Apr 1996 test(1B)