A shell script is a script written for the shell, or command line interpreter, of an operating system.
1
vote
2answers
257 views
Print given number in reverse order
clear
echo "Enter a number"
read n
sd=0
rev=0
while [ $n -gt 0 ]
do
sd=$(( $n % 10 ))
rev=$(( $rev *\ 10 + $sd ))
n=$(( $n / 10 ))
done
echo "Reverse number of entered digit is $rev"
...
0
votes
1answer
97 views
Deleting Non-empty Directory with smbclient
How can I remove a non-empty directory with smbclient?
I have tried the following:
1) rm
Result: NT_STATUS_NO_SUCH_FILE listing [dir_path]
2) recurse;rm
Result: No Error but also nothing happens! ...
1
vote
1answer
58 views
Automation of openldap installation
In my group we often install ldap on new servers. We have two different configurations currently. A mirrored configuration and just a regular standalone configuration.
The installation process gets ...
0
votes
1answer
61 views
How to safely enlarge a gzipped file?
I have a gzipped file (around 3Kb), and I want its size to be exactly 4000.
To achieve this goal, is it safe to add trailing padding with zeroes? (By safe I mean that the content of the gzipped file ...
1
vote
1answer
262 views
Command/scripts to check the Reverse DNS Lookup time
I am working on a project in which one master communicates with numbers of slaves. For that it has to make connection with hosts in network. But sometimes it hangs.
I think that the reason behind is ...
1
vote
3answers
123 views
Reading a directory in shell script
I want to read a numbered directory which is under a path, into a variable in shell script.
The paths are something like this:
.../releases/R1/...
.../releases/R2/...
.../releases/R3/...
Each time ...
0
votes
1answer
128 views
Solaris 10, Shell Script, Cursor movement [closed]
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <time.h>
void prtime() {
time_t rawtime;
struct tm * ...
6
votes
1answer
227 views
redirect and log script output
I am trying to tidy up the following snippets, design goals are to log all output from a script, and should not be a wrapper. Less lines are better.
I don't care about user inputs (at this stage), ...
0
votes
1answer
65 views
zmodem not working without minicom
I want to upload and download file from and to the target board. I am able to send the file from the target board to PC using zmodem protocol to be specific using command
sz -vv -b filename > ...
-3
votes
3answers
140 views
Find files with similar names in a folder using shell script
I have a requirement of selecting xml files from a folder of same ID's.
E.g. There are files with name
S-000001-0-0.xml
S-000001-0-1.xml
S-000001-0-2.xml
S-000001-0-3.xml
S-000001-0-4.xml
...
0
votes
1answer
332 views
How to parse XML to CSV with a shell script?
What is the ideal way to parse an .xml file into a .csv file that I could include with my shell scripts. I know bash cant do it but I'm unsure if I should try in awk or sed. I imagine a language ...
0
votes
2answers
100 views
Shell script parameter substitution
I have seen a line of shell script as follows:
local soft_upgrade=${3:-false}
What does this mean? I don't know what 3:-false means.
5
votes
2answers
71 views
Why does set -e not work inside () ||
I've run across some scripting like this recently:
( set -e ; do-stuff; do-more-stuff; ) || echo failed
This looks fine to me, but it does not work! The set -e does not apply, when you add the ||. ...
1
vote
2answers
107 views
sed pattern matching with deletion over a line
I want to delete only some spaces(say 4) after the line$#*425 with space
I am not able to complete it please suggest
echo "line$#*425 with space " | sed 's/ /\1 \2/g'
i am thinking of ...
1
vote
1answer
93 views
Copy files excluding x,y,z causing error in shell script
I'm not well versed in shell scripting but I imagine this to be a painfully easy fix but its eluding me.
I need to copy the contents of a directory excluding a number of files. I have a command that ...
1
vote
2answers
79 views
how obtain directory files info
I have the need to get information about a specific directory, basically I need to know the correlation between small, medium and big files.
I came up with this:
for i in K M G; do
printf $i
du ...
1
vote
2answers
71 views
case + how to implement equal or less or greater in case syntax
My target is to verify a range of number with (only with case + esac), and print the range. So for example:
If the number is between 0 and 80, print >=0<=80
If the number is between 81 and 100 ...
1
vote
1answer
135 views
File is readable by everyone, but I can't open the file
I'm fairly new to Unix and I have written a script:
SERVER="/usr/local/abc/.../somefile.txt"
OPTION="$1"
if [ x$OPTION = "xtitle" ]
then
grep $OPTION $SERVER
exit
fi
As far as I ...
6
votes
5answers
624 views
Binary to hexadecimal and decimal in a shell script
I have a context where I need to convert binary to hexadecimal and decimal and viceversa in a shell script. Can someone suggest me a tool for this?
1
vote
1answer
76 views
Running a script as Grub boot option
I'm assembling some DR stuff for my Linux boxes. One item that would be really handy would be a GRUB option that would run a script to change my boxes from static IPs to dynamic.
I know we could do ...
2
votes
1answer
110 views
How to wait for a subprocess used for I/O redirection?
Consider the following snippet of Bash script:
exec 3> >(sleep 1; echo "$BASHPID: here")
do-something-interesting
exec 3>&-
wait $!
echo "$BASHPID: there"
When executed, it produces:
...
-1
votes
3answers
176 views
How to run a shell script with export command in crontab
I have a shell script that exports values of variables when executed. The same values will be used in another script.
How to run this script(test.sh) in cron.
#!/bin/sh
export I="10"
echo $I
I will ...
1
vote
1answer
100 views
Cannot enter in centOS with any user
I am using cent OS Operating system without GNOME.
In the starting, it asks
localhost login:
Password:
It has one user named service under group name service whose password is also service.
I ...
2
votes
1answer
111 views
bash scripting add arguments
I have created a script which takes parameters and arguments. I want to insert the --help argument.
I already know how to parse normal arguments with -, but I don't know how to parse the -- ones.
to ...
2
votes
1answer
353 views
Bash vs ksh pipes
I am stuck with some problems with my scripts in ksh. FWIW the problem which I am unable to overcome is that when I use a structure such as this
command | while read VAR1
do
many.commands using ...
2
votes
2answers
91 views
How to send text to a command and THEN read from terminal
I'd like to know if it's possible to send some to a command's stdin and then keep reading from the terminal.
The problem i'm trying to solve is executing some initialization code every time i open a ...
2
votes
1answer
192 views
Script to turn off laptop keyboard if USB keyboard is present [duplicate]
My laptop keyboard is broke (Esc keeps randomly being pressed, can't fix it), so I've bought a USB keyboard instead. I want to write a script that will run at login which will check if my USB keyboard ...
1
vote
2answers
168 views
Ignore all matches to negated extglob pattern in recursive ls
I would like to recursively list all files in a directory which match a given input pattern using ls. (Oh, and this is in Bash).
The only way I can think of to do this using ls is to shopt -s extglob ...
4
votes
4answers
793 views
Text between two tags
I wanna retrieve whatever is between these two tags – <tr> </tr> – from an html doc.
Now I don't have any specific html requirements that would warrant for an html parser. I just plain ...
2
votes
2answers
304 views
whiptail or dialog
I am going to create script which will use user input, so I decided to use whiptail, but little bit confuse that which one is portable and will work in ubuntu 10.x and higher and CentOs5.x and higher.
...
1
vote
1answer
68 views
what is diffrence between “$var” and “${var}” [duplicate]
i have seen in many script usage of "$var" and "${var}", so I just want to know diffrence between "$var" and "${var}"
2
votes
2answers
389 views
list all files newer than given timestamp and sort them
I want to list all files (sorted by date) that are newer than timestamp in format 20130207003851 in directory /tmp only. Subdirectories can be omitted.
Using SUSE Linux Enterprise Server 11.
The ...
2
votes
1answer
152 views
how to start from within my shell-script xterm which starts mplayer and plays the files that are the argument of the script
What I want to do: Start my script with a list of files as arguments. From within my script I want to start xterm that starts mplayer with these files.
I tried several things. I call my script like ...
3
votes
2answers
330 views
Iterate over multiple parameters with spaces in bash script
I have a bash script for my RaspberryPi (running Raspbian) that is supposed to take multiple file names as parameter(s) and play one after the other (using omxplayer). The basic structure is this:
...
1
vote
1answer
257 views
How to remove trailing whitespace at the end of the line in given files (more than one)?
I'm sooo fed up with useless spaces in source files that I've even configured vim to show them.
The problem is that I'm very often (if not always) have to deal with useless spaces with my mates ...
4
votes
2answers
509 views
What's a safe and portable way to split a string in shell programming?
When writing a shell script, I often want to split a string. Here's a very simple example:
for dir in $(echo $PATH | tr : " "); do
[[ -x "$dir"/"$1" ]] && echo $dir
done
This will ...
2
votes
4answers
111 views
How to write a very simple wrapper that provides default parameters?
Given a program that requires some parameters, e.g. program -in file.in -out file.out, what would be the simple-most approach to write a bash script that could be called with or without any of these ...
1
vote
2answers
151 views
Query list of servers for memory/cpu allocated
Running RHEL 6.2, trying to write a bash script to SSH to a list of remote servers, and write the CPUs and Total Memory to a file, one line per host in the following format:
HOSTNAME1 CPUS: 12 ...
3
votes
4answers
100 views
Unix - how to fetch files based on the part of a filename that is date
Say I have files say like
AA_XX_20111208
AA_XX_20111207
AA_XX_20111206
AA_XX_20111205
AA_XX_20111204
AA_XX_20111203
So using the date part,
how can i fetch previous 2 month files ?
For e.g. this ...
5
votes
2answers
173 views
what is the meaning of 1 at the end of awk script
I was reading this awk script
awk -F"=" '{OFS="=";gsub(",",";",$2)}1'
I want to know what is the function of 1 at the end of it
1
vote
1answer
345 views
Reading the contents of the file and splitting using ksh
We're using a ksh script for installing one product.
I've another config file, I'd need to read this configuration file from my main script
Content of the Configuration file:
...
1
vote
2answers
54 views
Reduce redundant logfile
I often have longer redundant log files, redundant in the sense that blocks of text repeat with minor changes. The length of the files makes it difficult to spot the actual information. I had the idea ...
1
vote
2answers
117 views
How to remove element from the list?
I have written a command that output a list of hostnames, e.g. :
clab148node11
clab148node12
clab148node15
clab148node16
Now, I would like to remove those nodes that do not respond to ping. For ...
1
vote
1answer
82 views
What does sourcing a file mean in a shell? [duplicate]
Possible Duplicate:
Different ways to execute a shell script
What happens when I issue the following command:
source devenv.csh
How does it differ from running it just as devenv.csh ?
3
votes
1answer
78 views
Why does sh display an error when bash does not?
Why does the following script display an "unexpected operator" message and fail when run with SH, but not with BASH.
!/bin/sh
if [ $UID -ne 0 ]
then
echo "You must be root."
exit 1
...
5
votes
2answers
317 views
Extracting a string, according to a pattern, in a bash script
In bash, suppose that I have a string strname:
strname="ph7go04325r"
I would like to extract the characters between the first "3" character and the last "r" character in strname, saving the result ...
4
votes
2answers
95 views
How to define a Bash function that can be used by different scripts
I have defined a bash function in my ~/.bashrc file. This allows me to use it in shell terminals. However, it does not seem to exist when I call it from within a script.
How can I define a bash ...
2
votes
1answer
373 views
Good method to compare time?
I need to check for the current time and abort the script if it is not proper time of day I am supposed to run it. Also, if anyone else runs it, it should abort.
For example: I need my script to only ...
-3
votes
1answer
135 views
Shell scripting for cron job [closed]
I have created a cronjob in Unix to execute an .sh file which will send me the output of an Excel file to my mail id once it is executed.
But now I do not want an email if there is a "NO RECORD" or ...
4
votes
2answers
112 views
Is it possible to store ssh connection in bash script instead of $(ssh user@ip command) every time?
I think that the code that I already have is not very efficient as it has to connect each time to the same machine and execute a command. Code:
tmp=$(ssh -nq $USER@$IP "$COMMAND" 2>> $LOG)
...
