Questions about shell scripts, executable files that are interpreted by a shell (bash, zsh, etc.).

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0
votes
1answer
22 views

move files with special characters to new directory

I'm trying to write a loop for a script that checks a specific directory for any special characters and moves those files to a specific directory (except spaces and hyphens - those are simply replaced ...
2
votes
2answers
33 views

Send command output to screen and syslog

I'm trying to send the output of a command to our syslog and this is what I have so far. #!/bin/bash log() { logger -s -t $(basename $0) "$@" } /bin/echo "test" 2>&1 | (log) and this ...
2
votes
0answers
29 views

Memoizing/caching command line output

I have a bash script I use to run a few python and C++ programs in a sequence. Each program takes in some input parameters which I define in the bash script. So as an example I run the program like ...
0
votes
4answers
48 views

How to remove duplicate rows from a file?

File, TABLE1 ------- 1234 TABLE1 ------- 9555 TABLE1 ------- 87676 TABLE1 ------- 2344 I want the output like TABLE1 ------- 1234 9555 87676 2344
1
vote
2answers
51 views

How to modify (not add to) a number variable?

Suppose that a=$((1)) How can I change the value of a from 1 to 01? I just want to insert the 0 before the current value of a and rewrite it. a=$((01)) would not be a solution in this case because ...
9
votes
2answers
146 views

Shell Syntax: How to correctly use \ to break lines? [duplicate]

I used to believe that the appropriate way of breaking the lines in a list is command1 && \ command2 It turned out that it isn't so , one doesn't need \ $ [ $(id -u) -eq 1000 ] ...
-7
votes
0answers
37 views

Unix Script to read log file [on hold]

I've a requirement to read recent five log files out of 100. Each log file contains pattern like below: Log Pattern 04/30/2016 01:01:26.073 INFO => T:1 ########### big data retrieve tier 2 call ...
0
votes
1answer
53 views

How to pass a parameter with space in nohup? [duplicate]

I have script to run a jar, like shown below. user="Tim Tom"; jarfile=./app.jar SC_CD="java -jar -Xms512m -Xmx2048m -DUSER='$user' $jarfile" nohup $SC_CD And im geeting error message as Error: ...
-4
votes
1answer
28 views

Unpack a shell archive (.shar file)

I have a shell script. How can i remove anything before # this line Everything before the # should be deleted. The script is too long to delete it manually. How can I do that automatically? ...
2
votes
1answer
31 views

If there are more than x number of pipes in a csv line, then delete the 2nd instance

I have a csv file which is supposed to contain 4 columns of data which include a product number, a title, a url and a price. Each column is separated by a | delimiter (this has to be maintained, there ...
0
votes
1answer
34 views

How to maintain only four lines in my file in shell scripting?

Input file: 01.05.2016 87893938 02.05.2016 35435345 03.05.2016 35435345 04.05.2016 12345678 I want to keep only four lines in my file. that means if date 05.05.2016 6905698 is inserted then ...
0
votes
2answers
31 views

Add newline character to file

Hi Guys i need to change the below single line string using a shell script {1:F01NESWSZM0AXXX1111111111} {2:I940BBRUBEBBXXXXN} {3:{108:400MSOG161200FRO}} {4: :20:400MSOG161200FRO :25:1xxxxxxxx65 ...
1
vote
2answers
72 views

sh AND and OR in one command

Trying to check for 3 conditions in one line of code, but I'm stuck. Essentially, I need to code for the following: IF string1 is not equal to string2 AND string3 is not equal to ...
13
votes
5answers
1k views

Compress a large number of large files fast

I have about 200 GB of log data generated daily, distributed among about 150 different log files. I have a script that moves the files to a temporary location and does a tar-bz2 on the temporary ...
1
vote
2answers
44 views

How to rename certain directories if the parent has a particular name?

I have to do some global renaming in an Eclipse plugin project, although the fact that the code is Java and it's an Eclipse plugin is irrelevant. Basically, the steps I need to perform are the ...
0
votes
1answer
14 views

custom shutdown script in rc6.d does not seem to be working.

I'm working with a software application that's a bit touchy so I wan't to shut the software down automatically on reboot or shutdown. I have created a script an placed it in /etc/init.d/ with a ...
2
votes
1answer
65 views

Cannot mv to a subdirectory of itself

I am running this simple script and I am trying to create a cron job so that the file gets copied to my thumbdrive (with the new name) sudo cp /home/pi/NewLog.log /media/usb sleep 20 cd ...
-3
votes
0answers
26 views

Regarding shell script [on hold]

I have 3 servers, one is the app server and the other two are database servers. Following are the IP addresses of my servers: App server: 192.168.1.1 DB-server-1: 192.168.1.2 DB-server-2: ...
2
votes
1answer
28 views

Why does this script not accept two arguments?

Code #!/bin/sh # http://tex.stackexchange.com/a/20886/13173 # http://unix.stackexchange.com/a/280830/16920 # $Id: pdf2eps,v 0.01 2005/10/28 00:55:46 Herbert Voss Exp $ # Convert PDF to encapsulated ...
0
votes
3answers
37 views

Issue with the shell script after storing the directory in a variable

FTP is connecting to the server but i am getting an error - Enter if the env is dev or test or prod: test Please enter the id no : xxxxxxx Connected to xxxx 220 (vsFTPd 2.2.2) 331 Please specify the ...
1
vote
1answer
25 views

how to inject keystrokes in a program like Safari from a bash script?

I am trying to automate some keypresses every few minutes. The exact timing is still undetermined. But basically I want to capture a live chat dialogue. I'm sure I could do this more elegantly. I ...
1
vote
1answer
41 views

Printing the file with number of hardlinks

I can print the number of hardlinks to files in directory by using find . type f -printf "%f %n\n" but this will also print the hardlink not only original files: Example: file1 is an original ...
1
vote
1answer
31 views

Rc.local not running commands properly

I am running arch Linux and have used this rc-local service: [Unit] Description=/etc/rc.local compatibility [Service] Type=oneshot ExecStart=/etc/rc.local RemainAfterExit=yes [Install] ...
66
votes
1answer
7k views

Why does the following script delete itself?

If you create an executable file with the following contents, and run it, it will delete itself. How does this work? #!/bin/rm
0
votes
2answers
30 views

.sh query - running a ssh task

This is on a macintosh but it's still unix command. I am running some computers on a network that have file sharing turned off because of security so the only way to connect is via ssh. I need to ...
1
vote
0answers
25 views

Access to bash arrays in gnuplot [duplicate]

In a bash script I have several arrays which I need to access in a gnuplot code: #!/bin/bash ... # fill array a[*] and b[*] ... gnuplot <<EOF do for [j=0:10] { # access ${a[j]} and ${b[j]} } ...
-3
votes
1answer
59 views

Need help in a shell script

I need help with the below shell script. I have three environments: test, dev and prod. When the user enters test it should ftp to test host and ftp the file. Same in case of dev and prod. I have just ...
0
votes
1answer
31 views

tar directories containing spaces [duplicate]

I want to archive my photos into tar archives. The directory containing photos has one dir per year and multiple dirs inside each year dir: Photos 2005 2006 Some dir with spaces ...
0
votes
0answers
26 views

Fixing Signal 13 Error on find

I have a situation where I'm trying to install softwares into my system. I'm using a fakeroot approach to install them in a separate directory where I'm listing all the files, directories and links ...
3
votes
3answers
101 views

Reverse sequence of a file with POSIX tools?

Is there any clean, clear-cut POSIX equivalent to tac? Readability as well as succinctness should both be considered.
1
vote
0answers
12 views

Linux Mint Corners Musical Sequence Associative Array

I am writing a script which uses hot corners to play specific musical notes when hovering in corners, and depending on the musical sequence to execute a specific command. The script is called with ...
3
votes
2answers
48 views

Accessing Google-translate via wget

I don't want to call the whole Firefox/Chrome/Opera... to find out the meaning of a word with the Google translate, so I decided to write a shell script which uses wget to get the content of ...
0
votes
2answers
34 views

How to use file test to check if a file already exists in a directory

I'm trying to write a script that asks the user if they are sure they want to move a file to a certain directory. The script needs to check if the file already exists in the target directory and if it ...
4
votes
2answers
60 views

Millisecond time in a shell script

How can someone print the entire time ie, for example 12:07:59:393(HH:MM:SS:milliseconds) in milliseconds. I found a lot of posts saying how to print Milliseconds along witht HHMMSS but I want to ...
3
votes
3answers
82 views

How to prevent script from deleting itself

Hi I'm creating a recycle bin script with the command name 'safe_rm'. I was wondering, how can I prevent the script from deleting its own file. I believe the readlink command is one solution however ...
-1
votes
0answers
27 views

Python to Shell Script? [migrated]

How can I convert this simple python code to Shell script? import time import sys cur_time = int(time.time()*1000) print cur_time sys.exit(1)
3
votes
3answers
201 views

Bash replace characters in the output

I need to replace characters in the output of a script but they are NOT in the last printed line. They are in the middle of the output. E.g. ...
-6
votes
0answers
27 views

How to find Multiple strings present inside a file and send a automatic mail if not present [on hold]

I have a requirement like there are 9 strings i need to look for in two files(one has 4 and another has 5). My script should look into those files and notify me via mail if its not present. Hi, let ...
0
votes
1answer
55 views

Need help on shell scripting

I need a help on my shell script. Below is my shell script which transfers the file from one server to another. #!/bin/bash echo "Please enter id no : " read input_variable echo "You entered: ...
-1
votes
0answers
36 views

How to compare two tables in Linux using shell scripting? [duplicate]

I have two database one is "old-tables" and one is "new-tables". We have made some changes in "old-tables" database. then updated "old-tables" database we are calling it "new-tables" database. ...
-1
votes
2answers
45 views

How to compare two tables and find the difference between in Linux using shell script?

I have two release one is old and one is new. I have to compare old release DB and new release Db and find out all the difference. like if old release and new release have same table so what they made ...
1
vote
1answer
36 views

bash script does not compare file names with [ and ] correctly

I have a bash script that deals with files. It finds all the files in one directory and searches for the name of each in another directory. For that it uses "${myfiletobesearched}" inside the ...
1
vote
1answer
74 views

Pattern matching [duplicate]

I am trying to follow Bash Cookbook to learn about Bash Scripting. I am on example 6.8 Testing with Regular Expression. I have the following script: #!/usr/bin/env bash # cookbook filename: ...
1
vote
1answer
20 views

mv command with path wildcard containing random string

Im trying to move a file to a path which has a random string that I cannot know in advance ~/.config/foldername/45fhiu84.dev-edition/subfolder/ I have tried mv ~/Downloads/myfile.txt ...
0
votes
2answers
20 views

Simple Bash server usign netcat and authorization required [closed]

Running a simple server in bash: echo -ne 'HTTP/1.0 200 OK\r\n\r\n'; cat page.sh | nc -l -p 8080 The script page.sh generates website. It works and meets my expectations. Is there a possibility of ...
0
votes
1answer
29 views

Can all of fork(), exec() and system() be wrong? [closed]

I understand why it could be less than best practice if I write C code that executes shell commands by calling system() and that it's better to use exec and fork but then a very experienced C ...
0
votes
2answers
37 views

Can we install a package through a shell script? [duplicate]

I'm trying to write a shell script so that when I reinstall my Ubuntu again. I could just run script and retain all the packages. And I'm planning to pass password in form of argument. My question ...
0
votes
1answer
32 views

Script for connection with ssh then command once connected

I need to write a script that connects to a remote server, then once connected, connects from there to another server, then changes directory. The following of course does not work (it connects to ...
-3
votes
0answers
20 views

Bash Script problem with Variables from files [duplicate]

Trying to get this script to work how ever I get an error no matter how I try to set the varibles. After checking the varibles are not being set from the files that the information is in.
-4
votes
2answers
32 views

Linux Bash script fails with a syntax error

Trying to get this bash script to work: #!/bin/bash for result in $(cat ./fn7); for dip1 in $(cat ./fn4); for dip2 in $(cat ./fn5); for dip3 in $(cat ./fn6); for ip in $(seq 0 255); ifconfig > ...