I have a statement using eval:
Now I want to use the “variable$input” in some commands but I don't know how to call it without replacing the $input with the command line value (which I obviously can't do).
e.g. when I try
Can you tell me what I am doing wrong?
i'm a grad student taking a UNIX course and a networks course (i have a background in C++ and JAVA). i'm trying to combine the two classes.
My questions stems from a networks programming homework assignment below:
"Using the operating system and language of your choice, develop a program to... (5 Replies)
Thinking of using our San for network backups..
Have a Netra 240 being installed and planning to get some space on our San.
Do you know what software is used to access the San from my server or what I would need to do? I know how to connect to local storage, disk arrays etc but not sure what... (1 Reply)
Hello all,
I need to develop an application that would be used as a simulator to test various custom algorithms. As I have never embarked on this kind of work, I need some advice:
1. Which GUI library to use in Linux, GTK+ or FLTK? The simulator application needs to output various... (2 Replies)
Hi
I have a CentOS 5 server with LVM.
/ and /home are low on disk space. I have ~12Gb available on /usr
I plan to resize /usr and add the available space to the other 2 partitions.
Please advice me on any precautions I need to take.
Any problem if you have faced doing similar stuff and... (0 Replies)
/usr/sbin/ifconfig -a | grep "inet" | grep -v "inet6" | grep -v "127.0.0.1" |
grep -v "0.0.0.0"|grep -v "192.168.100.2" | awk '{print $2}'
I use above command to get IP addresses on AIX boxes.Values coming here are set to a variable "Host IPs.IP Addresses" in my fingerprinting engine.
... (4 Replies)
All,
I would like to know my below requirement can be achieved in any way in Shell Scripting? I will make this requirement of mine as understandable as I can.
Requirement:
I wrote a script 'my.script' which gets user-input tablenames and puts the same into an array. Also I get other inputs... (6 Replies)
Scenario:
Command used to capture IPs on a host:
/usr/sbin/ifconfig -a | grep "inet" | egrep -v "inet6|0.0.0.0|192.168.100.2" | awk '{print $2}'
Following for loop used to capture interface names:
for INTERFACE in `/usr/sbin/ifconfig -a | nawk '$1 ~ /:$/ && $1 {sub(":$", "", $1); print... (3 Replies)
Evening all,
Im trying to get a script that will:
Select the most 3 recent files in a specific directory
Run a command on them (like chmod)
Ask of you would like to continue
Copy the files to another directory
If a linux guru could help me out, it would be very much appreciated.
Thanks... (2 Replies)
Hi all,
I have written a wrapper script in Perl which will be used on AIX, Linux and Windows and I do not want to change any code for the needs for a specific OS if avoidable.
It works fine so far on all 3 OSes, not blowing up any stacks any more, but I am unsure how to handle writing log files... (7 Replies)
Hi Experts,,,
Need your help/advice on how to fix this
I have 2 users under same group (primary group) and i want to give 777 permissions on a directory to one dir owned by user1 when granted i can see than from getfacl but when i actually login as user2 i can touch a file .
... (3 Replies)
Discussion started by: maddyfreaks1
3 Replies
LEARN ABOUT OSF1
source
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)