This looks almost like homework so I'm not gonna go into much details. If you have any specific questions post them back here.
1. Expand the variable "DEBUG" *if, and only if* it's already defined, else use zero.
2. Print the contents of the first script argument.
3. Defines a function that checks if a file does not exist. "tee" is a specific purpose command; Take a look at the man page (man tee).
4. Defines another function that checks if the contents of $DEBUG aren't equal to 1 (numeric value, not string).
5. String assignment.
6. "-z" is a comparison operator used to tell if string has zero length.
In all cases the syntax ${var} is used to "protect" the variables. E.g:
Code:
var1="asdf"
echo "${var1}2"
echo "$var12"
One of the above "echo" statements will work fine and the other will throw an error. Try it for yourself to find out which one fails and why.
Hi all....
I was wondering if there is a lot of differences between /bash and ksh programming.
Im learning about bash programming, but all what I had read in this forum, points me to learn more about ksh over bash. Is that right and why?
Unfortunately, I can’t write ksh progs on my work,... (2 Replies)
how to i grep a keyword which ignore upper case or lower case.
for an example :
user enter CoUcH
and the grep also can grep couch which in text.txt although upper or loever case is different .. how to do that ?
any idea? (1 Reply)
I have a file that is 20 - 80+ MB in size that is a certain type of log file.
It logs one of our processes and this process is multi-threaded. Therefore the log file is kind of a mess. Here's an example:
The logfile looks like: "DATE TIME - THREAD ID - Details", and a new file is created... (4 Replies)
Doubt #1
I have a program that I want the user to input date. When the user inputs the date, is it able to format it to system date dd-mm-yyy and then echo the value into a text file?
Doubt#2
If the above is not going to work, I tried to have the system date appear in the user input field and... (6 Replies)
Write a Shell script to analyse the disk usage of students in a particular class.
The program should allow the user running the script to input the particular class name (group name) as an argument to the script.
The script should create a file called “logfile” in the home directory of the user... (2 Replies)
Hello
I have a unique problem of needing to delete large files slowly off of an XSan.
I was wondering if there is a script I could use to delete 100gb chunks of files and folders that get placed in to a watch folder, slowly so as not to disrupt the other users. I would like to use Automator in... (0 Replies)
Hello all;
I have little knowledge of bash programming, and I was wondering if you could help me out.
I would like to create a bash script, as detailed below.
process.sh is the bash script itself
list.dl is a text file. In this text file, the first line is the directory from... (1 Reply)
Please take a look I am stuck on step 4
1. The problem statement, all variables and given/known data:
#!/bin/bash
### ULI101 - ASSIGNMENT #2 (PART A) - DUE DATE Wed, Aug 3, 2011, before 12 midnight.
###====================================================================================
###... (13 Replies)
Hi! I'm new in bash programming and I need to make an script that reads a txt file line by line (every line is like "Name;FirstLastName;SecondLastName;Sex") and has to give every student 3 random marks, its average and add a counter if they are male/female and if they passed. I've been trying with... (4 Replies)
Discussion started by: HeartHacker
4 Replies
LEARN ABOUT SUSE
rbash
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 filename 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)
09-11-2013
