Hi,
I was trying to do something where I would be able to export one local variable in a telnet subshell to its parent shell.
I found something like this over here, but couldnt exactly understand it .
I am referring to this part actually:
Can someone pls provide me with some explanation of the above or provide me with some link where things like exec 4>&1 and all are explained in proper detail?
Thanks.
Hi, i've got an executable shell script, called mysc.sh with this line only:
export DATASIZE=0
i run it from my console (./mysc.sh), and after that in the console i run:
echo $DATASIZE
and nothing prints
what could be the problem???
thanks!! (2 Replies)
Hi ..
I have a dynamic script called from a programming language called Powerhouse (4GL).
The module, called QUIZ, allows the user to call shell commands from within it...
i.e.
!rm -f mipss156t2cmd1.bat mipss156t2tmp1.txt
!printf '#!/bin/csh\n' > mipss156t2cmd1.bat
!printf 'setenv... (0 Replies)
Hi,
I am using bash and need to run a set of tcsh scripts that set environment variables. Is there a way to do this? Any help greatly appreciated. (3 Replies)
I have a question about how to change variables in parent shell.
My script, test.sh, is below:
#!/bin/sh
# test.sh
PATH=.
The commands I ran for test:
$ echo $PATH
.:/usr/bin:/usr/sbin:/usr/local/sbin:
$ sh test.sh
$ echo $PATH
.:/usr/bin:/usr/sbin:/usr/local/sbin:
... (1 Reply)
Hi,
I haev to devlop a script which when executed will take in a sudo privelege and run a set of commands then will go back to parent shell and execute the rest of the command
But the problem I am facing is that when the script is executed it takes the sudo privelege but it waits for the... (0 Replies)
hi experts(novice people can stay away as it is no child's game),
i am developing a script which works like recycle bin of windows.
the problem i am facing is that when ever i am trying to delete a file which is situated in parent directory or parent's parent directory i am unable to... (1 Reply)
Hi, I am looking for a solution for the following problem:
Im Using tcpdump within a shellskript started in a subshell by using brackets: ( /usr/sbin/tcpdump -i ... -c 1 )
- I want the outout of tcpdump saved in a variable
- Than tcpdump-Process in the Subshell should be killed
- and I... (6 Replies)
Friends...This is the first time i am trying the report generation using shell script... any suggestions are welcome.
Is there a way to set the font size & color when i am exporting the data from unix shell script as a CSV file ?
The following sample data is saved as a .csv file in the... (2 Replies)
Hello,
I'm very new to Linux, and I have a question, I'm hoping you could help me with. :)
I have created a file called subject, contains this code:
#!/bin/bash
read -p "Student Name: " NAME
read -p "Student ID: " ID
read -p "Address: " ADDRESS
I'm to create another file called... (7 Replies)
Discussion started by: iwant2learn
7 Replies
LEARN ABOUT X11R4
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)