01-22-2007
10 More Discussions You Might Find Interesting
1. Linux
Can anyone tell me how/where to get the source code for the unix commands like "ls ,finger,cp....etc" commands . I
have tried very hard but failed so far.
Thanks
JAGDISH MACHHI (4 Replies)
Discussion started by: jagdish.machhi@
4 Replies
2. Shell Programming and Scripting
I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config.
I am not sure if I can do this with BASH scripting.
I have set up password less login by adding my public key to authorized_keys file, it works.
I am a little... (1 Reply)
Discussion started by: bash_in_my_head
1 Replies
3. UNIX for Dummies Questions & Answers
just curious -- I was wondering if it's possible to open the file for a command and look at the code (say for the command more). I've just read about the PATH variable and the type command to find out where the file is, but when I tried to open the file, the terminal exited and logged me out.
... (3 Replies)
Discussion started by: Straitsfan
3 Replies
4. Shell Programming and Scripting
Hi:
I have a requirement as below:
I have some standard Unix commands modified and kept them in a directory say /usr/clsh/bin. For example I have a script named "ls" kept here which is modified version of "ls" (say it always gives long listing i.e. ls -l).
When any user logs on and types... (2 Replies)
Discussion started by: ramesh_samane
2 Replies
5. UNIX for Advanced & Expert Users
hi Folks!!
Just got a question in mind....
Is it possible for us to read the c code of the commands in the bin directory? I work on a LINUX server and i only see executables in the bin directory which i obviously can't read. Please help me regarding this.
Thanks in advance and wishing you a very... (2 Replies)
Discussion started by: bdiwakarteja
2 Replies
6. Shell Programming and Scripting
Hello All. I suspect that this will be a clear noob question, but I haven't been able to figure it out using the usual methods, so I turn to you.
I've written a script to create input files for the quantum chemistry program NWCHEM. Generally you create an input file and then execute it by... (12 Replies)
Discussion started by: EinsteinMcfly
12 Replies
7. Shell Programming and Scripting
I need an if code in shell script where it should continue to further commands after succesfully installing the executable file.
i.e. /run installer is continuing but in the middle it executes further commands like "cp /root/user which were given after /run installer.
I want /runinstaller... (16 Replies)
Discussion started by: sriki32
16 Replies
8. AIX
Hi all,
I'm new in this forum.
I'm looking for the difference between the HACMP commands with the prefix "cl" and "cli".
The first type are under /usr/es/sbin/cluster/sbin directory and the second are under /usr/es/sbin/cluster/cspoc directory.
I know that the first are called HACMP for AIX... (0 Replies)
Discussion started by: peppix
0 Replies
9. Shell Programming and Scripting
I have a korn shell script that executes a function which is stored in a common library. In the function there is obviously some code. Here is the line of code in the function in question:
temp=`echo $status_cnt|tr -d `
When the shell script executes with set -x, I'm seeing that on most... (2 Replies)
Discussion started by: mjf
2 Replies
10. UNIX for Beginners Questions & Answers
I am not able to run basic commands on my centos 7 server. The PATH variable looks correct I think. I have not seen this before and not sure what to do next. Thank you :).
# cd /usr/bin
# ls
bash: ls: command not found...
Similar command is: 'lz'
nano ~/.bashrc
bash: nano: command not... (6 Replies)
Discussion started by: cmccabe
6 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)