I think your so-called one-liner is not. It is multiple commands (one of them over-complex) joined on a single line, making it hard to read.
Here it is written more sensibly (with a few tweaks too):-
I have used a meaningful variable name rather than just i and read the file into a while loop. It is clearer to read and the input does not risk get eaten up by the commands within the loop.
The line ending \ can have nothing after it. It means that the new-line is ignored, so on execution it is joined up but means it is somewhat easier to read.
I would suggest you are trying to do too much in one step with pipes from the output to grep, then awk, then cut, then xargs, then cut, then cut, then grep, then cut and finally sed
A tool like awk can do all of this (although it might need to call out to nslookup) which will neaten your code too.
Can you explain what you are actually trying to achieve? I think I've got it, but if I have misinterpreted, I don't want to write it out and have you think that I've got it.
Thanks, in advance,
Robin
Last edited by rbatte1; 10-17-2017 at 08:14 AM..
Reason: Added welcome
folks;
i'm trying to write a shell script to do the following:
1. i have a file with 39 fields, i'm trying to add 10 more fields with (!) as a field separator. with the following requirement:
if field number 20 has a value, then field number 40 will show as (!M!), and if the field number 20 does... (2 Replies)
Hi guys...
I am a newbie to scripting... I have a small requirement... I dont whether u r clear with my requirement... But plz try to help me...
Like,
tell me some kind of scripts that can help me in retreiving the data from the datasets.
Regards,
Mahesh... (1 Reply)
Hi guys...
I am newbie to Shell Scripting...
I am querying the Oracle database.I want a Shell script for fetching some data from datasets in Oracle database and displaying in an excel sheet.This is my requirement..
Can u plz help me guys..
Regards,
Mahesh... (4 Replies)
Hi Guys,
I am quite new to Shell Scripting... I need ur help.. This is very urgent.
The thing is like,
I need to match a IP address (ex 192.168.200.56) i.e, xxx.xxx.xxx.xx inside a KSH script,but if we enter in different format other than the specified format (ex jjj.ksj., 1.0...), it should... (3 Replies)
Hello,
Guys I am having a sql script file which contains some sql statements including inserting values, One column is of the data type date.
Now i am having a KSH script for inserting values via this script into the database.
The problem I am facing that when I am inserting value in the... (1 Reply)
Hello,
I have an ASCII file (many files of the same format, but different dates and numbers) in the format like below:
2008.01.02,08:00,1.46520,1.46520,1.46410,1.46440,70
2008.01.02,08:05,1.46450,1.46560,1.46440,1.46540,79
2008.01.02,08:10,1.46530,1.46540,1.46490,1.46500,46... (8 Replies)
I am having an issue with a script that I created today, my first attempt at this, and was wondering if anyone can give me insight to what changes need to be made. Below is a copy of the script that I have written. WEe are trying to monitor whether or not a services is running. I do have a cron... (1 Reply)
needing this script to shut down 1 IceS and start up another, close the 2nd one after 12 seconds and then reboot. here is what i have so far
#!/bin/bash
ShutDown() {
echo "Shutdown in progress."
wall <<ENDOFWALL
CI Shutdown has been intiated!!!!
Shutdown will occur in 30 seconds...... (1 Reply)
I am having a problem. which I have described below>>
I have to run a script with the format : <File_name><Start_date><End_date>
abcd.sh 19-JAN-2015 01-May-2014
problem is I need to compare these two dates and throw an error as start date must be less than or equal to end date.
But... (13 Replies)
Hi All,
I am facing a problem when i am trying to run shell script more than 5 times.
I have shell script(.sh file) which ran perfectly fine in the early attempts(1,2,3,4 runs). But if i try to run the script more number of times, i am facing the below error message.
Too many ('s
I do... (3 Replies)
Discussion started by: am24
3 Replies
LEARN ABOUT LINUX
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 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)