Tagged Questions
A script is a sequence of commands or instructions that are executed by an interpreter program rather than compiled into a standalone executable program.
1
vote
2answers
34 views
bash division of numbers in text file
I have two numbers in test.txt file, I would like a way to divide the second number by the first number and assign the result to a variable or file in a bash script that I can use. I have used awk ...
1
vote
2answers
28 views
Need special validation for shell script
I want to create a bash script which will have lot of options while executing.
# script.sh --dry-run --user <parameter1> --pass <parameter2>
I heard about getopt option but looks like ...
1
vote
0answers
14 views
Capture errors in a SFTP script
I have a sub sh file which puts receives an input of local directory and path to the remote directory and sends the file to the remote directory. If the remote path is invalid the error cannot be ...
1
vote
1answer
54 views
Please explain the syntax
Can someone explain the syntax of the following commands? II know what they do but was having a hard time getting the syntax,
find / -type f -exec grep -H 'text-to-find-here' {} \;
cat access.log | ...
-1
votes
1answer
52 views
How to write a auto-completion bash script?
I want to run some functions (which I created in ./.bash_func) in terminal with some files located somewhere. When I type the function and hit Tab Tab I want to list the files located in ./scipts like ...
1
vote
4answers
57 views
Delete all files in a directory
I have a directory which includes some files and some folders containing other files. I'm trying to remove these files in the main directory without touching the folders or their contents.
I'm using ...
2
votes
1answer
28 views
Copy files that partially matches another files in another location
I have a list of jpeg files in a directory like this (below is just a sample, like the structure is the same but this there are many fo0# sub-folders, not only fo01 and fo01, where each of these ...
2
votes
1answer
27 views
Remove newlines in file names
I have a PHP code that generates the file name on which wget will append its logs. I generated 2000+ files, but the problem is I am having trouble working with them because I had a mistake of putting ...
-2
votes
2answers
29 views
grep to get all the getters from a java file
I have a java file called Friends.java . There are 5 variables and each variable has its own getter. Assume that all the functions below follow standard java standard, i.e
public methodName(){
//Some ...
2
votes
2answers
33 views
Is shell parent of all the processes in linux
I have been trying to understand shell scopes and environment in depth. I have been reading about how if
we do export VARIABLE=VALUE it will be available in subshell. So I wanted to ask a question I ...
1
vote
2answers
36 views
How do I update the dates (by 30 days) in the files going to that specific location in unix?
How do I update the dates (by 30 days) in the files going to that specific location in unix? Can awk or sed help ?
File format is as below -
Thomson: xyz
Format: 1
Character_set: ASCII8
File_type: ...
0
votes
1answer
78 views
Linux Bash Script Ideas [on hold]
I have been given the task of creating a shell script to show my proficiency in scripting. I am really struggling with ideas on what to do. I would like to create something that is relevant and could ...
0
votes
2answers
32 views
While Read loop to email
I'm having issues with a script i'm writing. I'm trying to monitor free disk space, and to have an email generated for each filesystem over a certain threshold. When using this script with 'echo' ...
0
votes
0answers
14 views
Perform task on waking up from suspend
I have program that misbehaves when my pc wakes up from suspend to ram, it starts using up to 40% of processor time so i usually have to kill it manually.
How can i set specific command (pkill in ...
6
votes
2answers
921 views
How to make a temporary file in RAM?
I have a script that will pipe its output to |tee scriptnameYYMMDD.txt. After each cycle of the for loop in which the output is generated, I'll be reversing the file contents with tac ...
0
votes
1answer
14 views
I'm trying to deploy with git to a semi-managed vps, need to write a script to change owners
I'm trying to deploy my sites on my company's semi-managed vps server using this tutorial: https://www.digitalocean.com/community/tutorials/how-to-set-up-automatic-deployment-with-git-with-a-vps
It ...
-1
votes
0answers
17 views
Making a secret to take contents of a file encode it and outputs to a file and to be able to decrypt the message [closed]
Script names :make secret, read secret
makesecret takes the content of the file msg-norm and encodes it and outputs the encrypted message to the file msg-mixed
readsecret then decrypts the ...
0
votes
1answer
13 views
How to force decimal addition (#10) when adding numbers with a carry (octal issue)
How can I get 10#1$result to work correctly?
When creating a calculator for adding two numbers I am adding together by transversing the digits from small to large. e.g. for adding 51 plus 51 I am ...
-1
votes
1answer
22 views
Command output to file, new lines at beginning
I'm rewriting some 20+ year old Unix scripts and I want the output to go to the screen and a file. I know this is possible with tee. Is there a similar command that stacks new lines on top, at the ...
2
votes
1answer
28 views
use mutt to send email through specific port on CentOS 7
What specific syntax do I use to get mutt to send an email through port 587 on a CentOS 7 server?
For example, the sender is [email protected], the recipient is [email protected], the ...
0
votes
1answer
26 views
Avoid conversion to scientific notation in awk
I have a csv file that contains hundreds of columns.
I would like to subtract the value of a specific column from a static number and then print the entire line.
The values of that column are long ...
0
votes
5answers
155 views
How to get current working directory? [duplicate]
I want to have a script that takes the current working directory to a variable. The section that needs the directory is like this dir = pwd. It just prints pwd how do I get the current working ...
1
vote
1answer
24 views
how to compare a decimal value with a integer in shell scripting? [duplicate]
Could anyone please help me for comparing a decimal value with a integer in shell scripting?
Example:
i=1
j=1.2
if [$j -gt $i];then
echo "growth"
else
echo "None of the condition met"
fi
Im ...
1
vote
1answer
22 views
Batch rename “case duplicates”
I have a folder on my Linux system that is cross-synchronized with other computers, some of them with Windows. The problem is that in that folder there are files that are "case duplicates", i.e. their ...
0
votes
0answers
17 views
Add extra parameter for text label or just echo it outside the call?
I have written a program that allows me to test my functions.
I call it like this: do_test function_name expected_result parm1 parm2
For example do_test add_2_nums 10 5 5
Now I need to call the ...
-6
votes
0answers
35 views
Script for compare two file permissions
create dir, create two files with diff permission. Now write a script to test the permisiion of these two files.
If its same then display the filename with its permission.
if not display the ...
1
vote
1answer
55 views
Shell script runs diffrently based on working directory.
I have a script which runs differently based on current working directory.
Basically it processes an .ini file and takes parameters from it and runs mysql backup.
Script is running as root user.
...
1
vote
0answers
34 views
Why the output is not written to log from expect script
I am trying to write the output of the netcat command including the command also to a file by logging into remote servers.
But it is not writing. What am I missing ?
#!/usr/bin/expect -f
set user ...
0
votes
2answers
58 views
how to save the contents of a webpage in a file using shell script
how to save the contents of a webpage in a file using shell script. Web page is using URL, username and password to open.
curl -O odcview:password ...
2
votes
2answers
33 views
How can I copy and move a sequential subset of files?
I have a directory containing 1772 files named PRC0001, PRC002,... up to PRC1772.
How can I copy a subset, for example PRC0257 to PRC1516 to a different directory? I am trying to do this for several ...
2
votes
5answers
218 views
cut for key-value pairs
I am looking for an easy way to cut key-value pairs (where the key is unique and specified) from text, much like how cut can be used to cut a specified column in a CSV file. The keys I'm looking for ...
1
vote
0answers
24 views
programmatically alter kde file associations
Problem:
In kde I want to remove a particular file association from every file type
Details:
I wanted to try out clamTk as a companion to clamAv. It didn't suit my needs so I uninstalled the ...
1
vote
1answer
47 views
Why do some apps leave KeyRelease events to be consumed by next focused app/window
I'm trying to wrap dmenu within some script to feed it input and act on it, however when pressing the Return key to select some dmenu input, a KeyRelease event gets sent to whatever window is focused ...
4
votes
3answers
283 views
Run command automatically when files are copied into a directory
I have two folders called: A and B, in different paths on the same computer. When I add any new file(s) into folder A, I want to copy it to folder B automatically.
My folders:
/auto/std1/nat1/A
...
0
votes
1answer
86 views
bash if, then and else statement
I am learning bash, I ran into a small problem when trying to write a small script
#!/bin/bash
clear
read num
if [ "$num" -eq 2 ]
then [ -d "/etc/passwd" ] | sudo cp /etc/passwd /home
echo ...
1
vote
1answer
24 views
Possible to deliver centrally configured login scripts on Linux?
In Windows you can assign login scripts to users which run whenever they log into a system which allowing admins to do things like map drives/printers and generally do anything for which there isn't a ...
1
vote
4answers
98 views
Script to delete files that don't match certain filenames
I have a folder with 500,000 images, sorted in subfolders by year and month. I'd like to create a script that does this:
If the filename does not match any of the filenames in names.log then delete ...
2
votes
2answers
134 views
Bash menu with multiple parameters in one row
I have searched a couple of days and still didn't found the answer. I hope that you can point me in right direction.
I would like to know how to write a bash script with a options, that can be
...
7
votes
7answers
181 views
What is the purpose of having two variables ($@,$*) to transmit the arguments of a command into a script? [duplicate]
I have read of the special variables used in a script $@ and $*.
As far as I understand, the arguments used while executing the script are stored into two special variables, once all arguments into $@ ...
4
votes
1answer
110 views
print the content of files
I have a list of parent folders, sub folders and files inside the folders and the sub folders. I used the following command line to list the content of the parent folders and the sub folders:
tree ...
6
votes
4answers
513 views
Why is it “while kill -0 $PID” and not “until kill -0 $PID”?
I may be being daft here, but if I want to do something while a process is running, why do I do:
while kill -0 $PID
do
#...
done
instead of
until kill -0 $PID
do
#...
done
?
kill -0 ...
1
vote
2answers
42 views
Script to backup home directory creating a compressed tar file in the /var/local directory
#!/bin/bash
tar -czvf backup.tar.gz /home/administrator
Having problems with making sure the file is created in the /var/local directory.
0
votes
0answers
17 views
Dual partition scheme with GRUB
I would like to use a dual partition update scheme for some servers like CoreOS is doing here.
Basically the process is the following:
The computer has partition A and B, each with a full Linux ...
1
vote
1answer
34 views
Saving result between script executions
I have a script in /opt which is called regularly by Cron. The script needs to write and read a status flag between executions. In what directory should I store the flag? I'm thinking that /tmp might ...
2
votes
1answer
59 views
ssh and run script on remote host and answer expect answer automate
The ssh from server0 to (server1,server2,server3) (no password need to SSH (trust exists between all servers and private key exists on all servers)) but a remote script on server (server1,server2 ...
0
votes
1answer
37 views
bash: getting integer expression expected
Here is the piece of code that gives the problem:
if [ " ls -l ~/sysbackups | wc -l " -gt 5]
What to do?
0
votes
1answer
53 views
Run a Vim command from a bash script
This is related to a question I asked earlier but I would like to keep it separate in case anyone else can find use in it.
I have a command that I am running on a file called dummy.out from the ...
2
votes
2answers
60 views
Bash Scripting VIM commands
I have a few files that I have an annoyingly repetitive group of VIM commands to apply to.
They are basic VIM commands just to delete some lines which are not supported by the process I need the files ...
1
vote
1answer
30 views
Auto-start multiple background user sessions in Linux Mint
I could use some help with what I think is a basic request on the newest edition of Linux Mint (which I think would also be applicable to Ubuntu).
I have a home system with 3GB of RAM and accounts ...
1
vote
1answer
34 views
value too great for base (error token is “08”)
Trying to do quiz 'max sum of 2 from grid'
Can't figure out how to get around the error below.
Feels like I'm missing something. Once I find out what I can update the question to be more general ...
