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1
vote
2answers
64 views

Why does this not work when the load average exceeds 1?

I have been testing this script and its behavior has been odd. The script should generate notifications whenever the load average exceeds a specified limit. Whenever I pass a CPU_LOAD_LMT >=60, no ...
0
votes
1answer
35 views

List of 'if' switches anywhere? [on hold]

Is there a list of all the if switches for use in bash scripting? Sometimes I see someone using it and I wonder what the switch they're using actually does. Example is the -z in this one. I know how ...
3
votes
3answers
63 views

Rename the last 8 characters in filename

I am receiving video files with different names but the final 8 characters of all are numbers (also different every time). This is the pattern of the file name: custom text 00030402.avi I have to ...
3
votes
1answer
37 views

How do I fix the argument received from getopt?

I have the following commands in my script: set -- `getopt -q agvc:l:t:i: "$@"` ... while [ -n "$1" ] do -i) TIME_GAP_BOOT=$2 shift ;; ... sleep $TIME_GAP_BOOT When invoking the script ...
1
vote
1answer
26 views

Scrot command - how to save only thumbnail

I'm using scrot to take screenshots from terminal. However when I want to generate thumbnailed version using parameter -t, I got two files: screenshot.png and screenshot-thumbnail.png. How can I ...
10
votes
5answers
317 views

Bash script to get ASCII values for alphabet

How do I get the ASCII value of the alphabet? For example, 97 for a?
0
votes
3answers
46 views

bash script check if variable is is [A-Z]

How do I check if a variable is in [A-Z] I want something like this: read var while [ $var in [A-Z] ] do #code here done How to achieve this?
2
votes
1answer
44 views

download pdf files from using curl

How to download hundereds of .pdf files from http://www.ncbi.nlm.nih.gov/pmc/articles using a loop, for example for the following document ids: PMC3386155 PMC3625956 PMC3477654 PMC3531051 ...
2
votes
3answers
70 views

Use & (ampersand) in single line bash loop

I have been using this command successfully, which changes a variable in a config file then executes a Python script within a loop: for((i=114;i<=255;i+=1)); do echo $i > numbers.txt;python ...
0
votes
1answer
60 views

How to force google/youtube searches using the bash? [closed]

I am a bit new to linux (using mint). I am familiar with some of the commands and learned a bit how to write shell/bash scripts. Anyway, I'd like to know how to force the bash to do a Google or ...
3
votes
3answers
123 views

Script to prevent screen blanking using “mouse move” doesn't work

This is my attempt to make a script that will use a "mouse move" to prevent screen blanking while watching videos. I'm hoping to use the value for highest CPU% process in top and if CPU usage exceeds ...
2
votes
2answers
38 views

How can I add an array of arguments inside my rsync call inside a script?

I want to copy a folder to another location, while excluding some specific files Here is my current script: #!/bin/bash if [ -n "$2" ] then source=$(readlink -f $1) destination=$(readlink ...
2
votes
4answers
123 views

SSH exits after quit case in bash script

So I have the following standard script: #!/bin/bash PS3='Please enter your choice: ' options=("option 1" "Option 2" "Option 3" "Quit") select opt in "${options[@]}" do ...
2
votes
0answers
89 views

Script stops command in it with exit 0

When I write a bash script similar to this on RHEL 6, if [ "$2" = "" ] ; then echo vip.start: ERROR: no NIC specified echo vip.start: Need IP and base interface name exit 1 fi case "$1" ...
1
vote
1answer
36 views

Execute command supplied by function parameters

I'm trying to create a function method in a bash script that executes a command which is supplied to the method by the paramters. Meaning somethings like this: special_execute() { # Some code ...
0
votes
2answers
37 views

sed with auto escape character [duplicate]

CommentAppend() { # Comment line and append line below commented line local comment="$1" # search this line and comment it local append="$2" # Append this line below commented ...
0
votes
1answer
66 views

Problem with small bash script

I often run find in my code projects when I make a change somewhere and I have to find where it impacts other pieces of code, so I thought about writing a very small script to make this easier, call ...
3
votes
3answers
78 views

How to delete files only, but keep the directory structure?

I would like to delete every file, but keep the folder structure. Is there a way? NOTE: (I'm using GNU bash 4.1.5).
1
vote
0answers
40 views

FuncName(){} vs function FuncName() {} [duplicate]

There is two ways to define function in bash script. 1. function FuncName() { echo "$FUNCNAME" } 2. FuncName() { echo "$FUNCNAME" } So my questions is what's the different between in ...
0
votes
1answer
79 views

Processing multiple mails in a Postfix mailbox by making cronjob run per second-is that considered good practice?

I need to process at least three thousand incoming emails an hour that are received in a postfix mailbox. Processing involves extracting email attachments and sending the content of an email ...
1
vote
2answers
74 views

grep for strings that were found in a previous statement

I'm trying to find out if an address definition is used inside of fortigate configuration file. I extracted the section out of the configuration file, that contains the addresses. In that section the ...
2
votes
2answers
48 views

How to paste same information into 2 different files?

I'd like to create two files in /etc/skel using a script which does many other things in addition to the creation of the files in /etc/skel. The part from script regarding /etc/skel looks like this: ...
12
votes
5answers
697 views

Bash in Linux v.s Mac OS

I am buying an iMac. I've been working on Linux for a long time and I do a bunch of bash scripting. I was wondering if all the bash commands and features are available on Mac OS ? Anyone has any ...
0
votes
2answers
56 views

Assigning a value with echo piped together with the bc command and using a variable as an argument

Basically i'd like to assign to variable $finalbyte a value (which consists of a binary representation of a byte e.g 11100000). So trying to do that i put the following as part of some script: ...
0
votes
1answer
128 views

./script.sh : line 52 : 1372757584 : not found

I am getting this really weird error despite of the fact that the same script runs fine on one platform (Arch linux) but not on my other mobile platform (Maemo Linux). I'll pass here the relevant part ...
0
votes
2answers
57 views

I need to check a list of directories if it contains a directory newer than 1 month before now

Maybe the title is quite confusing so i'll try to explain what i have done until now. First of all i have build the list of directories i want to investigate with the code below: ...
2
votes
1answer
125 views

Graphically ask for password in a bash script and retain default sudo timeout setting

The sudo -A (SUDO_ASKPASS) option apparently causes sudo to lose the timeout (e.g., timestamp_timeout) setting. I want to use the sudo -A option but I want to retain the default timeout (e.g., 15 ...
1
vote
2answers
147 views

Find the process id of a java application in a bash script (to see if the target application is already running)

I know there are a million questions on getting the process ID, but this one seems to be unique. Google has not given me the answer, so I hope stackexhange will help rather than close this question. ...
3
votes
1answer
377 views

how to make my bash script look 100% like a GUI app (so user never sees terminal)

I created a bash script using kdialog (and it runs on Kubuntu 12.04). The GUI is used for every user interaction (after the first one). However, the script still has to be launched from the terminal ...
2
votes
1answer
245 views

start autossh reverse tunnel automatically when network comes up

I connect from my home PC thru an Internet server I own to a restricted client (that I also own) using a reverse ssh tunnel. I have a script that sets up the restricted client to middleman leg of ...
4
votes
3answers
142 views

Change the text on a single line number in multiple text files

Suppose that I have ten bash shell scripts: script1.sh, script2.sh, ..., script10.sh. Initially, all ten files are identical. Now, I would like to make two changes in each script: In each file, ...
3
votes
3answers
179 views

Securely feeding a program with a password

After understanding the problem with using a password in the command line, I need to find a way of feeding a program with a password without it being a problem (without the password being recorded ...
3
votes
3answers
258 views

How to remove any string from a file via shell scripts?

I try to remove string from .bash_profile. String is added when my shell script run: My string at bash_profile as follows: # for Myapllication export MYAPP_HOME=/opt/myapp I want to remove the ...
1
vote
2answers
233 views

Writing starting from a certain line number in a text file

In a bash script I want to write some lines to a text file, but this file has already been used before and there are texts in it. So I want to echo some additional text in it, starting from a certain ...
2
votes
2answers
249 views

Ubuntu Bash - Changing permissions to user files for automating Apache VirtualHost creation

Moved here from AskUbuntu I currently have a small Ubuntu Server 12.04 machine (test environment) with about 3 non-root users created. Each user has their own public_html directory under their ...
1
vote
1answer
246 views

Guide/help using Dialog with bash scripting

While I understand how to create menus, no guide I've found teaches how to actually link them to commands I was hoping to have something like: dialog--clear --title "n00b's spellbook" \ ...
2
votes
2answers
127 views

What scripting language can I use to automate a concatenation & zipping process?

For a project I'm doing I need to concatenate and compress (with zip) many (midi) files and compare their sizes. I've thought there must be some language that allows me to do something like this: ...
0
votes
1answer
145 views

How to get the arguments to a php function via grep?

I am writing a script to let me know the database login info for each PHP-based web site on a server that I am migrating. The login information is usually done either like this: ...
1
vote
1answer
124 views

What does mean ` AWK=@AWK@` in shell scripting

I found AWK=@AWK@ while reading sh script, it's something like AWK=$(which awk), but it's not working. So can anyone explain this ? Script : #!/bin/sh - # makelist.sh: Automatically generate header ...
2
votes
1answer
91 views

Open any kind of application with BASH

I have made a Java program that could open any application. Suppose there is a file name "*.jpg", the it would allow the OS to recognize the type of application and then open the default application. ...
1
vote
3answers
602 views

Compare multiple files

I want a bash-script to compare OR find differences for multiple files which are stored in different locations: Files under /tmp/test/ A.txt B.txt C.txt Compare with files under /home/oldtest/ ...
2
votes
1answer
70 views

How do I move .bash_profile away from home

I need .bash_profile to be synched with Dropbox. The easiest way I can think of is to "redirect" the shell to search for .bash_profile in a custom folder. So is that possible? Or are there any better ...
2
votes
1answer
161 views

bash script , echo output in box

I have created this Function , which generate below output on terminal , but this function seems complex, So I posted here for any improvement or for same alternate solution. #!/bin/bash function ...