12-15-2009
Command substitution can also be nested using backtick.
Last edited by proactiveaditya; 12-21-2009 at 01:47 PM..
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Is it possible to check the script syntax with some sort of command...? Without running the script .
I'm using Sun Solaris (3 Replies)
Discussion started by: bjornrud
3 Replies
2. Shell Programming and Scripting
This isn't a question--its a solution! Below is a script that I wrote for my own script file development which does what the title says. Its the closest that you can get to compiling what are otherwise purely interpreted script files. I offer it here simply for the benefit of anyone else writing... (12 Replies)
Discussion started by: fabulous2
12 Replies
3. UNIX for Dummies Questions & Answers
How could I check if a string variable contains at least (or only) 2 characters, and check and make sure that the string does not contain any numeric digits?...I need to know how to do this as simple as possible. and I am using the Ksh shell. Thanks. (1 Reply)
Discussion started by: developncode
1 Replies
4. UNIX for Dummies Questions & Answers
How could I check if a numeric variable has 5 digits in KSH...I have a zipcode variable that I know will always be 5 digits, and I want to print out an error if it is less or more than 5 digits the problem is that I have it as:
if ]
but this won't work because the statement doesn't see 0001 as... (3 Replies)
Discussion started by: developncode
3 Replies
5. UNIX for Dummies Questions & Answers
How would I go about getting the previous date on the server? I'm out of ideas...I am thinking that I could do it using the date command, but I am unable to find any information on doing it. For example if the current date is April 17th 2008 it would be (20080417) <- (YYYYMMDD). I need the previous... (4 Replies)
Discussion started by: developncode
4 Replies
6. Shell Programming and Scripting
hi all,
i have a shell (ksh) script where i am reading line by line from a grep command and i wanted to check if the grep command actually returned something or was null. i can do this by using -z :
if ; then .....
but this forces me to do something when $myVariable is null when i... (3 Replies)
Discussion started by: cesarNZ
3 Replies
7. Shell Programming and Scripting
Hi all,
Iīve already searched the forum but canīt find what i am doing wrong.
I am trying to compare two variables using ksh under red hat. The error I get is:
-ksh: .: MDA=`md5sum /tmp/ftp_dir_after_transfer | cut -d' ' -f1 `
MDB=`md5sum /tmp/ftp_dir_before_transfer | cut -d' ' -f1 `... (3 Replies)
Discussion started by: old_mike
3 Replies
8. Shell Programming and Scripting
#!/bin/ksh
#This script will check status of load balancer in AIX servers from hopbox
#Steps to do as folows :
#Login to server
#netstat -ani | grep <IP>
#check if the output contains either lo0 OR en0
#if the above condition matches, validation looks good
#else, send an email with impacted... (7 Replies)
Discussion started by: vinil
7 Replies
9. Shell Programming and Scripting
Gurus, Please need your help.
I'm saving a filetimestamp into $filetimestamp and
say....echo $filetimestamp gives 2015021612
I'm saving a cutoff_time into $cutoff_time
say....echo $cutoff_time gives 2015021514
now my requirement is to check if $filetimestamp is greater than... (4 Replies)
Discussion started by: thummi9090
4 Replies
10. Shell Programming and Scripting
Hello,
I am working on my first ksh script to review daily reports. The script uses different functions to check different types of reports in csv format. A control file gets read in with information regarding the report, other info, and the function to use.
When I run the script I get the... (4 Replies)
Discussion started by: bot9196
4 Replies
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)