1
vote
3answers
76 views

How to sum match numbers

I'm new at scripting, and need some help. Will appreciate your answers. I got this assignment, which is to find the sum of all five-digit numbers (in the range 10000 - 99999) containing exactly two ...
0
votes
1answer
46 views

reading file using for, while - behavior

Consider the below scenario 2 vms - 192.168.229.131, 192.168.229.132 Both the vms has it's ip as 192.168.229.151 & 192.168.229.152 in it's /etc/hosts file Say there are around 50 vms like i ...
0
votes
1answer
43 views

Bash error: “[y command not found” [duplicate]

I am trying to get this script to function correctly but I get ./passmark.sh line 7: [y command not found. Here is my script #!/bin/bash # A simple script to ask a user for a pass mark and then ...
1
vote
1answer
35 views

count matches and mismatches group by

Please help with a shell script of the following. I need count number of consistent variables in each lane (col1) across samples (col2). For example, since all the values (col4) of lane1 variable 1 ...
1
vote
1answer
27 views

How can I maintain line breaks in body text with mailx when sending attachments?

I have a script that emails the text of a log file as the body of the email. That log file has some blank lines between lines of text for readability. When I use the following line in the script, ...
0
votes
1answer
31 views

How to replace symbol || with |“”| using sed

I have a file that uses | as a delimiter. Some of the records have empty cell as || (nothing inside). I am trying to replace them with |""| with following sed command: sed -i 's/\|\|/\|""|/g' file ...
1
vote
2answers
39 views

Append a file, output to screen and redirect from stderr all at once, without tee

I'm running a time dd command in a shell script, and I'd like to output the results to a file, and print it out on the screen. The line that I'm currently running is: (time dd of=$dest_filepath ...
5
votes
3answers
154 views

Use bash's read builtin without a while loop

I'm used to bash's builtin read function in while loops, e.g.: echo "0 1 1 1 1 2 2 3" |\ while read A B; do echo $A + $B | bc; done I've been working on some make project, and ...
0
votes
2answers
44 views

Bash Script using read needs to stop executing on Ctrl+D

I need to write a script that will add a line to a text file if Enter is pressed. But, if Ctrl+D is pressed, I need to exit that loop in the bash. touch texttest.txt LINE="0" while true; do read ...
1
vote
2answers
110 views

Motion start sequence - shell script modification

I've tried to modify this script to start Motion using the following libraries. I start the script by entering the following command into terminal: sudo /etc/init.d/motion start Which Gives: ...
3
votes
3answers
315 views

Better way to run single for loop instead of two for loops

This works but the way I did this is kind of silly. Is there a better way to do this? for e in $(ipcs | awk '{print $2}'); do [[ "$e" = "Semaphore" ]] && break echo $e ipcrm shm ...
-1
votes
1answer
43 views

syntax error: unexpected end of the file

#!/bin/bash #organization: Seneca College #Purpose: Validate a date #Usage: chkdate year month day # year=$1; month=$2; day=$3; extra=$4 if [[ "$year" == "" || "$month" == "" || "$day" == "" ]]; then ...
-1
votes
1answer
38 views

how to select multiple exit

I'm new to bash scripting and I don't understand what's wrong with this specific part of my script. im trying to select all the exit that have in my script. and trying to put in conditon that if all ...
2
votes
2answers
81 views

Bash not equal string comparison

Why does this cause an infinite loop? #!/bin/bash while [[ "$(ipcs | awk '{print $2}')" != "Semaphore" ]]; do #Gonna get rid of the echo after working echo "$(ipcs | awk '{print $2}')" #I wanna ...
0
votes
1answer
101 views

Bash if statement [: missing `]' error [duplicate]

I am having trouble with bash. I am trying to put a command in an if statement and then compare it to a string. This works perfectly. echo $(ipcs | grep Shared | awk '{print $2}') When I put it in ...
1
vote
3answers
121 views

bash script that reads user input and uses “cal” command to validate dates

I want to write a script that reads my input (for example if my script is called "check", then I would type "check 9 4 1993" and that input would go through the cal command and will check through the ...
4
votes
2answers
584 views

How do I delete all of a set of files in a random order?

I have a set of files, all that are named with the convention file_[number]_[abcd].bin (where [number] is a number in the range 0-size of drive in MB). i.e there is file_0_a.bin, file_0_b.bin, ...
2
votes
1answer
178 views

How to remove file log with file name

Assume, I have log files with this name format. NameLog.log.2014-09-27 NameLog.log.2014-09-28 NameLog.log.2014-09-29 NameLog.log.2014-09-30 NameLog.log.2014-10-01 NameLog.log.2014-10-02 ...
0
votes
3answers
50 views

How to run a script in multiple instances ? ( Ubuntu server )

How can I run a script in multiple instances in Ubuntu server? For example, I have a long running script named scanner.sh placed in /usr/bin/, which I wish to run the script in 10 parallel ...
1
vote
2answers
52 views

A tiny and simple script fail and this is the output “No such file or directory”

The script is: #!/bin/bash IFS=" " command="ls /tmp" for file in `$command`; do echo $file done And the output is: $ ./test.sh ./test.sh: line 17: ls /tmp: No such file or directory
1
vote
1answer
34 views

ffmpeg script - slicing a video into multiple slices

I am currently using ffmpeg to slice video files. I automated the process through a script called ffmpeg_split.sh. To view the script click here. When I run the script I have an error when trying to ...
-3
votes
1answer
50 views

How to use `cal` to run scripts? [closed]

I wrote a script and need to make it run with the cal command. How do I do this? This is my .bashrc: PATH=/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/lib/ast/bin:/home/$USER/bin:.
4
votes
2answers
125 views

When is 'if' not necessary?

In some scripts, I've seen if conditional statements written as: if [ some_conditional_statement ]; then # do stuff fi or [ some_conditional_statement ] && #do stuff Is the second ...
2
votes
1answer
25 views

bash_logout only run command on last logout

This command is in my .bash_logout script to delete a temporary directory when I logout after running some processing: /bin/rm -rf /tmp/tmpdir/ However, I usually have more than one connection to a ...
3
votes
3answers
183 views

How to copy, execute and retrieve data from a remote computer?

I am trying to run some calculations on a remote computer. Basically I want to copy some files to the computer, load a software, execute the calculation, then retrieve the data back. I have created a ...
3
votes
1answer
86 views

Finding largest file recursively

I am trying to find the largest file in a directory recursively. If there is a subdirectory inside of that directory the function needs to go inside that directory and check to see if the largest file ...
-2
votes
1answer
596 views

convert CSV to XLS file on linux [closed]

The following Perl script can convert CSV file to XLS file the problem is that I need to install on customer Linux machine many Perl modules in order to run this Perl script , and actually I cant ...
0
votes
1answer
72 views

SSH to a server, execute update command that continues even after logging off the ssh session

Okay I saw a lot of questions like this, but almost all have either theoretical answers which do clear the concept but I am still not able to put it up in code. What I want to achieve using a bash ...
1
vote
3answers
80 views

Input two numbers and add them when “a” is typed, subtract when “s” is typed

So I'm having a little trouble with this code. When i try to execute I get the message line 12: 0: command not found #!/bin/bash let results=0; echo "First number please" read num1 echo ...
2
votes
4answers
75 views

Bash - How do I loop through subdirectories and extract the files

I have a directory called 10K_TIF (main directory). Within this main directory are multiple sub-directories each containing tif images. I want to read each TIF image and extract its path using a bash ...
4
votes
3answers
71 views

How to convert an unsigned decimal (less than 1<<32) to 4 bytes (binary) in bash?

Example: $ decimal=$(( RANDOM << 17 | RANDOM << 2 | RANDOM >> 13 )) $ echo $decimal $ printf "%08x" $decimal | xxd -r -p >bytes The result is in bytes file. Can it be done in ...
1
vote
3answers
54 views

Modify some files to add the file name

I have a bunch of text (hundreds of txt) inside a directory. Each of them has a unique filename. I want to insert filename of each file into the first line of respective files. How can I do that using ...
0
votes
3answers
60 views

Bash Combine Replacement and Sub String Extraction in One Step

For a string in this format: ./my-site.sub.domain.com I would like to remove the .,-, and /, and trim the remainder to 16 characters: mysitesubdomainc I've done this ...
2
votes
0answers
1k views

How to test shellshock against remote machine using a simple script [closed]

I am interested in testing for shellshock vulnerable machines that I don't have shell access to on my LAN's and WAN's such as IPMI cards and Internet of things devices. What is the best way to ...
3
votes
2answers
40 views

Parenthesis works in bash shell itself, but not in bash script

As the title says, I can run this command from my command line prompt: cp -r folder/!(exclude-me) ./ To recursively copy all contents of folder except for the subdirectory named exclude-me into the ...
0
votes
0answers
30 views

Ubuntu 14.04 HDMI UDev Script

I have tried multiple variations to this script but I cannot get it to work. The UDEV Rule fires the script and the script exectutes but simply does not change the audio profile. If I run the script ...
16
votes
7answers
700 views

How to efficiently generate large, uniformly distributed, random integers in bash?

I have been wondering what would be the best way to get good randomness in bash, i.e., what would be a procedure to get a random positive integer between MIN and MAX such that The range can be ...
0
votes
2answers
34 views

7z from bash script won't exclude directories

I've encountered with kinda strange behaviour of 7z (or bash, I don't know yet.). With the following script: #!/bin/bash find /home/user -type f -name "*.pdf" | cut -c 10- > ...
0
votes
3answers
163 views

How to add a password to a specific command

I've been searching google on how to add additional security to a specific command without using sudo. Is it possible to add on a security feature without actually using sudo? For example: Whenever ...
2
votes
1answer
39 views

Single or double brackets and portability

I have found some very good answers here on the differences between [ and [[ in 'if' statements. For specific named shells, it seems to be a good idea to use [[ over [ (and it is faster, too). I'm ...
2
votes
2answers
45 views

How to run the dialog command with proccess?

NOTE: Please look at my code, it's a Bash script. I want to display both dialogs on the screen at the same time, one dialog displays this: tail –f from - /var/log/proccess1.log and the second ...
3
votes
3answers
161 views

Having an issue searching for a string in a file

I have tried to use a 'case' loop but it doesn't work for a reason unknown to me. This is my script for the case loop. echo "Do you wish to search again? [y/n]" read INPUT_STRING2 case ...
1
vote
0answers
37 views

tput command + how to locate dialog window on the top of the screen

Is it possible to use the tput command in order to place the dialog window on the top of the screen ? For example The following dialog command display the log is running by tail command dialog ...
0
votes
0answers
45 views

bash + timer in dialog window

is it possible to insert the following code ( timer ) in the dialog progress bar ? date1=`date +%s`; while true; do echo -ne "$(date -u --date @$((`date +%s` - $date1)) +%H:%M:%S)\r"; done ...
1
vote
2answers
84 views

How to grab output from command in shell script [duplicate]

I'm trying to write a shell script in RHEL which will execute grub-md5-crypt and the user will type their password. Now the problem is how can I grab the encrypted md5 hash displayed to the user in ...
2
votes
2answers
81 views

Shell script throws a not found error when run from a sh file. But if entered manually the commands work

Im trying to use the following script to generate a sitemap for my website. When I run it as sh thsitemap.sh I get an error like this and creates an empty sitemap.xml file : thsitemap.sh: 22: ...
4
votes
1answer
270 views

Bash: Variable assignment doesn't seem to 'stick' [duplicate]

I am having a hard time tracking down the reason my 'boolean' flag variable won't stay false when a test fails inside a while loop. The script involves a few loops but essentially it is intended to ...
2
votes
2answers
73 views

Fetching individual bytes from a binary file into a variable with bash

I need to make a fairly simple bash script to pull bytes one at a time from a binary file, send it out a serial port, and then wait for a byte to come back before I send the next one. This is ...
2
votes
3answers
59 views

Repeat Last N commands [duplicate]

In bash, I tried writing a script to run the last N commands. For say, N=5 for i in {1...5} do !-5 done The problem is that !-5 gets replaced by the 5th-last command on my shell (say time) and ...
4
votes
2answers
74 views

Shell script error handling while assigning STDOUT to variable

I am trying to implement error handling in my shell script as described in the 2nd answer in Best practice to use $? in bash? My script looks like this: #!/bin/bash try() { "$@" code=$? ...