Wrong Shell Invoking My Script On Linux Post: 40196

Sponsored Content

Top Forums Shell Programming and Scripting Wrong Shell Invoking My Script On Linux Post 40196 by Perderabo on Wednesday 10th of September 2003 10:18:31 PM

09-10-2003

Administrator Emeritus

The second shell for unix was csh. Shortly after csh arrived, the SHELL environment variable was introduced. It was set to the value of the shell field in /etc/passwd. From it's inception, it was intended to be the user's favorite interactive shell. Programs like vi refer to it when when they are asked to spawn an interactive shell. If it also was for scripts, that would mean that we must use the same shell for interactive use and for scripts. csh was better than sh as an interactive shell but sh was better than csh for scripts.

The only exception to this that I know of is with the program "make". It reads the environment and treats each environment variable as a make macro. That includes the SHELL macro, the environment SHELL variable overrides make's internal deafault for SHELL. So all non-trivial makefiles now explicitly set the SHELL macro. make's habit of assuming that the entire environment is intended for it is not great behavior.

Perderabo

View Public Profile for Perderabo

Find all posts by Perderabo

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

invoking one shell script from other

hi, i am one day old in shell scritpting. how to invoke one shell script from the other? For eg.i have two shell scripts A.sh and B.sh. Inside A.sh i need to invoke B.sh and the return code of A.sh should be the value returned by B.sh. it would be better if you provide any sample shell...

2. Shell Programming and Scripting

Invoking shell script from html/jsp page

I want to invoke shell script named bubesh.sh when submit button clicked on html/jsp page.I am using an apache server and the html & shell script are in the same working directory.Please help.

3. Shell Programming and Scripting

Invoking Shell Script via php

list me commands to invoke a shell script from php once the submit button is clicked in the php page. Requirement is Once a submit button is clicked it should run a script that displays the outcome of the script in a html/php. Please help. Thanks in Advance, BubeshJ

4. Shell Programming and Scripting

returning to the parent shell after invoking a script within a script

Hi everybody, I have a script in which I'm invoking another script which runs in a subshell. after the script is executed I want to return to the parent shell as some variables are set. However i'm unable to return to my original shell as the script which i'm calling inside is invoked in...

5. Shell Programming and Scripting

invoking a shell script inside cgi shell script

Hi, I have an HTML form through which I get some text as input. i need to run a shell script say script.sh inside a perl-cgi script named main_cgi.sh on the form input. I want to write the contents of the form in a file and then perform some command line operations like grep, cat on the text...

6. UNIX for Advanced & Expert Users

Invoking shell script with perl command.

Hi All, I am using the following command to invoke the shell script from a perl command. perl -i.bak -pe'BEGIN { $cmd = "/opt/coreservices/tomcat-5.5.9/bin/digest.sh -a sha"; } s/(password=")(*)/ $1.`$cmd $2|cut -d: -f2|tr -d "\n"` /e ' $CATALINA_HOME/conf/tomcat-users.xml I need...

7. Shell Programming and Scripting

Shell script..invoking command and exiting at fixed intervals

Hi, I need to write a shell script. Based on command line param to script say demode=yes Need to run an ant command for an hour(configurable) Then exit Again run the ant command all this needs to be in a loop. Thanks in advance Raj

8. Shell Programming and Scripting

Invoking one shell script from another unix box

Hello All, I have a shell script A which is in one unix box. Also i have a script B in another unix box. Now i'm struggling to find a way to invoke A shell script from B shell script. Is it possible to do this in any way..Request you anybody please help me in this point. Thanks in advance.

9. Shell Programming and Scripting

Problem invoking shell script

whats wrong here?! ________________ #!/bin/sh # FILE: clean_dirs # GOAL : To clean up directories used in Oracle processing # LANGUAGE : shell script (sh) # PARAMETERS : Input_File # 11/07/02 acri - modified to cd into the directory so it will...

10. Shell Programming and Scripting

Invoking Application in Shell Script

Hi All, I have a scenario : 1. A list of servers naming server21, server 22, server 23 etc. This list of servers is separate for my environments. Env1 has 3 server Env2 has 5 serves Env3 has 10 servers 2. Each server accesses application through which I want to invoke some method. So...

LEARN ABOUT OSX

chroot

CHROOT(8)						    BSD System Manager's Manual 						 CHROOT(8)

NAME

     chroot -- change root directory

SYNOPSIS

     chroot [-u -user] [-g -group] [-G -group,group,...] newroot [command]

DESCRIPTION

     The chroot command changes its root directory to the supplied directory newroot and exec's command, if supplied, or an interactive copy of
     your shell.

     If the -u, -g or -G options are given, the user, group and group list of the process are set to these values after the chroot has taken
     place.  See setgid(2), setgroups(2), setuid(2), getgrnam(3) and getpwnam(3).

     Note, command or the shell are run as your real-user-id.

ENVIRONMENT

     The following environment variable is referenced by chroot:

     SHELL  If set, the string specified by SHELL is interpreted as the name of the shell to exec.  If the variable SHELL is not set, /bin/sh is
	    used.

SEE ALSO

     chdir(2), chroot(2), environ(7)

HISTORY

     The chroot utility first appeared in 4.4BSD.

SECURITY CONSIDERATIONS

     chroot should never be installed setuid root, as it would then be possible to exploit the program to gain root privileges.

4.3 Berkeley Distribution					  October 6, 1998					 4.3 Berkeley Distribution