Hi,
I am new to unix. Is their a way to pass the output of the line below to a variable var1.
ls -1t | head -1.
I am trying something like var1=ls -1t | head -1, but I get error.
Situation is: I get file everyday through FTP in my unix box. I have to write a script that picks up first... (1 Reply)
I have a shell script which does the encryption of a file where i am passing the file name as a command line argument,but later on the script waits on the screen to enter Y or N
what is the command i should be using on the shell script
#!/bin/bash -x
outfilename=file.out
echo... (8 Replies)
Hi all
I have got a file digits.data containing the following data
1 3 4
2 4 9
7 3 1
7 3 10
I am writing a script that will pass an argument from C-shell to nawk command. But it seems the values in the nawk comman does not get set. the program does not print no values out. Here is the... (1 Reply)
Hi,
I am facing a problem to pass command line arguments that looks like
<script name> aa bb "cc" dd "ee"
I want to pass all 5 elements include the " (brackets). when I print the @ARGV the " disappear. I hope I explain myself
Regards,
Ziv (4 Replies)
I have one working awk command line. Which taking data from the “J1202523.TXT” file and generating the “brazil.dat” file. PFB code.
awk '{ DUNS = substr($0,0,9);if ( substr($0,14,3) == "089" ) print DUNS }' J1202523.TXT > Brazil.dat
But now I want to pass two parameter as a command line argument... (4 Replies)
Hello all,
New to C and I'm trying to write a program which can run a unix command. Would like to have the option of giving the user the ability to enter arguments e.g for "ls" be able to run "ls -l".
I would appreciate any help.
Thanks
#include <stdio.h>
#include <unistd.h>
#include... (3 Replies)
Hi,
I'm trying to pass the variable in the find command like below
a=log.20111114
find /apps/file3_logs/env3/ -name '$a' -exec ls -lrt {} \;
but it's not working
thanks in advance.
Regards
Thelak (3 Replies)
Can we pass an argument to cut command as below
Suppose cut command is used in for or while loop and we need to pass the incremental counter
cut -f$i
Here $i is an argument.
Like wise it has to come
cut -f1
cut -f2
Where i=1,2,3,.... (1 Reply)
Hi.
I'm trying to do a "simple" thing.
grep -rls grepped_exp path | xgs
where xgs is an alias to something like:
xargs gvim -o -c ":g/grepped_exp"
now the problem is that I want to pass the "grepped_exp" to the piped alias.
I was able to do something like what I want without the... (4 Replies)
Discussion started by: hagaysp
4 Replies
LEARN ABOUT BSD
exec
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)