11-12-2005
You might want to review the
rules of these forums, and in particular
(6) Do not post classroom or homework problems.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
:confused: Does anyone know which command I can use to find out the length of a string held within a variable? (5 Replies)
Discussion started by: dbrundrett
5 Replies
2. Shell Programming and Scripting
All
I want to find the occurence of comma in a variable in KORN shell. For example :
var = test,test2,test3 ....
finding occurence of comma in this variable. Result = 3 now.
Please help me to write the code.
Thanks in advance.
Regards
Deepak (2 Replies)
Discussion started by: DeepakXavier
2 Replies
3. Shell Programming and Scripting
Hi,
I have a challenging task,in which i have to find the duplicate files by its name and size,then i need to take anyone of the file.Then i need to open the file and find for more than one pattern and count of that pattern.
Note:These are the samples of two files,but i can have more... (2 Replies)
Discussion started by: jerome Sukumar
2 Replies
4. Shell Programming and Scripting
So I have a log that contains something like this:
What I want is to get the first occurrence of "^localhost0" (at line start) and then everything else up to the last occurrence of "^localhost0" (at line start)
Ideally I don't even care about the 2 "localhost0" lines either. All I really... (6 Replies)
Discussion started by: jjinno
6 Replies
5. UNIX for Dummies Questions & Answers
Any help developing a command to find all files on the system named ".bashrc" that modify the PS1 variable. I wanna list the full file name, including the full path, and protection. Nothing else. (2 Replies)
Discussion started by: raidkridley
2 Replies
6. Shell Programming and Scripting
Hi All,
Am copying mulitple files in a directory in names File0,File1,File2 etc.
I need to print separately the PID of these copies using File names.
for((i=0;i<5;i++))
do
mypid=`ps aux | awk '/File$i/ && !/awk/ { print $2 }'`
echo PID is $mypid
done
It printed nothing. Thinking... (6 Replies)
Discussion started by: amio
6 Replies
7. Shell Programming and Scripting
Hi ,
I had a script in which there is a variable $LOG defined and I want to check where that variable is getting value from, is there a way I can check for that variable and it's value if it is defined in some other script function or script . I checked using command env and also export... (1 Reply)
Discussion started by: somu_june
1 Replies
8. UNIX for Dummies Questions & Answers
HI. I had an environment variable defined in my .bash_profile file and I deleted it. I opened a new terminal and looked inside .bash_profile and it's not there but when I type
printenv MYCONFIG
it reutrns what the value used to be in my .bash_profile still!! I did a grep for MYCONFIG and... (6 Replies)
Discussion started by: dissectcode
6 Replies
9. Shell Programming and Scripting
HI All,
am trying to find the position of space in a variable, it is working for other characters other than space
ulab="ulab1|ulab2"
find_pos=`expr index $ulab '|'`
echo $find_pos
above code worked fine but below one says syntax error
ulab="ulab ulab2"
find_pos=`expr index $ulab ' '`... (2 Replies)
Discussion started by: ulab
2 Replies
10. Shell Programming and Scripting
Hello All,
I am facing difficulty in getting the PID value & then assigning it to a variable,
kindly help me in resolving the issue.
Thanks a lot in advance.
The custom utility used inside the Test2.sh will process the file in a batch of 10 lines at once and for efficient memory management,... (3 Replies)
Discussion started by: duddukuri
3 Replies
exec(1) User Commands exec(1)
NAME
exec, eval, source - shell built-in functions to execute other commands
SYNOPSIS
sh
exec [argument...]
eval [argument...]
csh
exec command
eval argument...
source [-h] name
ksh
*exec [arg...]
*eval [arg...]
DESCRIPTION
sh
The exec command specified by the arguments is executed in place of this shell without creating a new process. Input/output arguments may
appear and, if no other arguments are given, cause the shell input/output to be modified.
The arguments to the eval built-in are read as input to the shell and the resulting command(s) executed.
csh
exec executes command in place of the current shell, which terminates.
eval reads its arguments as input to the shell and executes the resulting command(s). This is usually used to execute commands generated as
the result of command or variable substitution.
source reads commands from name. source commands may be nested, but if they are nested too deeply the shell may run out of file descrip-
tors. An error in a sourced file at any level terminates all nested source commands.
-h Place commands from the file name on the history list without executing them.
ksh
With the exec built-in, if arg is given, the command specified by the arguments is executed in place of this shell without creating a new
process. Input/output arguments may appear and affect the current process. If no arguments are given the effect of this command is to mod-
ify file descriptors as prescribed by the input/output redirection list. In this case, any file descriptor numbers greater than 2 that are
opened with this mechanism are closed when invoking another program.
The arguments to eval are read as input to the shell and the resulting command(s) executed.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
EXIT STATUS
For ksh:
If command is not found, the exit status is 127. If command is found, but is not an executable utility, the exit status is 126. If a redi-
rection error occurs, the shell exits with a value in the range 1-125. Otherwise, exec returns a zero exit status.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 17 Jul 2002 exec(1)