Simple shell running with exec family


Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
# 1  
# Erroneous question, so can be removed.

# Erroneous question, so can be removed.

Last edited by beginnerboy; 04-05-2019 at 06:17 PM..
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Working of exec family of functions

Hi, I am studying exec family of functions.Its man page says,it replaces the current process image with a new process image. If it replaces the binary,then after returning back,how does it get the previous parameters of the process which called exec?As replacing process image means replacing... (5 Replies)
Discussion started by: Radha.Krishna
5 Replies

2. Programming

Working of exec family of functions

Hi, I am studying exec family of functions.Its man page says,it replaces the current process image with a new process image. If it replaces the binary,then after returning back,how does it get the previous parameters of the process which called exec?As replacing process image means replacing all... (1 Reply)
Discussion started by: Radha.Krishna
1 Replies

3. Shell Programming and Scripting

Script Variables Inquiry, Values Okay in Standalone Exec, No-Show in Cron Exec

I have the following bash script lines in a file named test.sh. #!/bin/bash # # Write Date to cron.log # echo "Begin SSI Load $(date +%d%b%y_%T)" # # Get the latest rates file for processing. # d=$(ls -tr /rms/data/ssi | grep -v "processed" | tail -n 1) filename=$d export filename... (3 Replies)
Discussion started by: ginowms
3 Replies

4. Shell Programming and Scripting

Simple Script to Check running Process

#!/bin/sh CHECK='ps aux | grep start.jar | grep -v grep | wc -l' if then /usr/local/jre-1.7.0/bin/java - jar start.jar & else fi Could anybody advise whats up with this code im trying to put this in as a cron job to check that solr search engine is running every 10secs and if... (10 Replies)
Discussion started by: will_123
10 Replies

5. Programming

help me understand exec() family of calls...

how does exec() do it? on successful call of exec() family of functions, they never return... how to i emulate that. assume the standard example, execl("/bin/ls","ls",NULL); now this would never return. i m trying to emulate exec()'s never to return feature... #include<unistd.h>... (4 Replies)
Discussion started by: c_d
4 Replies

6. Shell Programming and Scripting

how to use exec command in C shell

i have a script where i am reading some lines from a file into another file.. script works fine in bash.. #!/usr/bin/csh awk 'NR>20&&NR<32' try.sum | awk '{print $4 }' >io awk 'NR>20&&NR<32' try.sum | awk '{print $9 }' >io1 awk 'NR>20&&NR<32' try.sum | awk '{print $14 }'>io2 exec 10<io... (1 Reply)
Discussion started by: npatwardhan
1 Replies

7. OS X (Apple)

Address family not supported by protocol family

Hi, I compiled with no error a C program, than I tryed to execute it and than I get this error: connessione al server fallita: Address family not supported by protocol family What does it mean? Why I get this error only on Mac os x while on Ubuntu the program works? The code is:... (3 Replies)
Discussion started by: DNAx86
3 Replies

8. Shell Programming and Scripting

Need Help Running a simple script

The following works: $ zgrep "TIME *0 *3 *10 " /opt/oss/report.gz | sed -e "s/ */ /g" 24659 TIME 0 3 10 OWNER 0 8 1 I need to queary over 1000 records, so I try: for b in $(cat /home/user/file | awk '{print $3,"*"$4,"*"$5,"*"$6" "}' | sed 's/^/"/' | sed 's/$/"/') do zgrep $b... (2 Replies)
Discussion started by: tony3101
2 Replies

9. UNIX for Dummies Questions & Answers

need to restrict program exec and running

I'm on Freebsd 4.5 stable, havin question of that kind: I need to restrict programs running, like BitchX for example, which can be dowlnoaded by logged on user, and i cant set permissions to all users to prevent that program from executing. And ipfw doesnt help me because of i need to allow that... (1 Reply)
Discussion started by: hachik
1 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)

Featured Tech Videos