03-16-2007
Quote:
Originally Posted by Shell_Life
Thank you for your information, cfajohnson.
I was just trying to help Pradeepred solve his problem.
We all know that there are innumerous ways to solve a problem in unix.
For the past 26 years, I have been working for several companies where,
the four most important things are:
1- To get the job done.
2- It does not break.
The point is that it WILL break if the original poster is not using the same shell as you.
Quote:
3- It is easy to understand.
4- It is easy to maintain it.
Again, I was just sincerely trying to help Pradeepred.
Sorry if I broke any rule writing any code that is not considered POSIX
shell script.
The reason for using a POSIX shell is to make the script portable. If you use a shell-specific, non-standard syntax, you may not be helping anyone.
Every *nix system has a POSIX shell, but it may not be bash or ksh93.
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RBASH(1) General Commands Manual RBASH(1)
NAME
rbash - restricted bash, see bash(1)
RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a file name containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO
bash(1)
GNU Bash-4.0 2004 Apr 20 RBASH(1)