A shell is software that lets users interact with the operating system, usually by typing at a command-line.

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2
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1answer
56 views

How to show a caret-C in canceled command line in zsh, like bash does?

When I'm in the middle of entering a line to my shell of choice, and change my mind, I can quickly throw C-c and start afresh. Under bash it looks like this: user@machine:~$ rm everything^C ...
1
vote
1answer
31 views

ZSH custom widget not working as I think it should

I'm trying to define a function so that I can launch Midnight Commander by pressing Alt-, but the function just doesn't work. I found and modified a function on another site and modified it so: ...
0
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0answers
459 views

Script to automate copy files with a pattern over network

I am trying to automate some tasks... I have to do some development work on one machine and other parts on another machine, with communication through a network share. I would like to copy certain ...
16
votes
3answers
1k views

Prevent currently running linux task to be killed after logout from SSH

I have a computational task running for a few days on a linux server via SSH connection. It is not on the background, so the SSH connection is under hold of the task. I want to restart the local ...
0
votes
0answers
19 views

Running terminal command on all files in folder? [duplicate]

I need to convert 500+ .xlsx files to .txt (or .csv). To do this I found this. It works well if I write the command like this: xlsx2csv fileA.xlsx fileA.txt I have however been unable to run the ...
1
vote
1answer
69 views

Tar not preserving permissions on extract

I'm backing up a users folder as root using tar tar -czf /mnt/disk/cloud.tar.gz -C /home/cloud/ . In /mnt/disk I do a test tar ztvf cloud.tar.gz and it shows -rw-r--r-- cloud/cloud 14 ...
0
votes
2answers
184 views

ascii value in bash/awk

i have a doubt, i know that with this command, it prints the value of a character based on the Ascii table: printf "%d\n" "'a" ##prints 97 But i wonder how can i make my programm show me the ascii ...
0
votes
1answer
59 views

Where do the variables of a new BASH shell come from?

I am puzzled as about how environment variables work. From what I am aware, for a new process to have some environment variables, its parent must have issued export. But what about all the variables ...
0
votes
2answers
289 views

How to check if busybox has a command?

In my case, I want to see if busybox has "md5sum" builtin. I am currently doing this: $ echo | busybox md5sum &>/dev/null && echo yes || echo no I have not been able to find any ...
2
votes
2answers
78 views

Warning for rm -r command

I want rm to prompt me when recursively deleting a directory, as in: $ rm -r <dir> Do you want to remove the dir(Y/N)? Is there an argument I can pass to rm that will do this?
0
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2answers
264 views

Bash script that calls a program with some asterisks in arguments

I’ve spent last hour or so trying to write a pretty simple bash script and I never felt so dumb. So I have a list of strings (which are package selector specifications for a package manager, if that ...
0
votes
1answer
52 views

Passing different set of arguments to the different commands in a linux bash script

I am writing a bash script foo.sh that runs too commands bar with first input argument, and baz with the second argument: #! /bin/bash bar "$1" baz "$2" Now I want to make foo.sh more flexible, ...
1
vote
5answers
180 views

How to copy hidden (starting with a dot) files and subdirectories in linux?

How to copy hidden files and hidden subdirectories (the ones starting with a dot) in folder A to folder B? For example if I have this structure: A/a A/b A/.a A/.b/ A/.b/somefile A/.b/.c I would ...
0
votes
0answers
107 views

OpenWrt Script (Inifinite Loop) Stops sending data over Serial Port

I have a TP Link Router TL-MR3020 flashed with the latest Attitude Adjustment. It is connected to an Arduino Uno via the usb port (usb cable into the arduino's type b connector). I have the following ...
3
votes
1answer
37 views

In bash, declare an alias that depends on current variable content

I would like to declare an alias (in my .bash_profile) that will use the content (value) of a variable when the alias is used, not when it is defined. E.g., alias goSomeWhere="cd $BASE/somewhere" ...
0
votes
1answer
52 views

modify shell command in Ubuntu 14.04

I had installed Ubuntu 14.04 on virtualbox, I need to be able to read source code of shell commands, and modify any command? any help please? where i can find the shell commands? in which directory?
0
votes
1answer
45 views

Kill browser tabs with Bash from younger to older

Hello i want to kill tabs from a browser(ex. chromium) by order from youngest to oldest. I used pkill -f -n -9 chromium but i want to use it in a while iteration with comparison to pkill's return ...
2
votes
1answer
264 views

What is the difference between “elif” and “else if” in shell scripting?

I am very new to shell scripting. When I look at some code, written for ksh (#!/bin/ksh) I see there is else if as well as elif used in one script. So, what is the difference between else if and ...
1
vote
2answers
48 views

Alter output of every command

I'd like to know if there's any way of altering output of every command I execute in terminal. The purpose is to make the output formated for my markdown howto's. E.g. ls -la .*z #>-rw-r--r-- 1 ...
1
vote
1answer
174 views

echo “something” > file not working when sh script is being executed by remote PHP server

I've got a web-server with my hardcoded webpanel for Source server management and I've got my VPS on CentOS which doesn't really want to execute sh script when asked from remote server. Web-server ...
1
vote
2answers
64 views

Good way to bookmark/navigate relative directory paths?

I work on a linux system with bash 4.x where I frequently find myself navigating different copies of very deep (and large) file directory structures. However, in reality I only need to access a ...
1
vote
2answers
210 views

Why is “source <(cmd)” working but not “$(cmd)”

I want to have a script to call with params which adds some aliases to my current shell. The aliases have to be builded in respect to the calling parameters and the current directory from where I ...
1
vote
1answer
154 views

Split very long line of words into separate lines of max length

I have a script that outputs a list of packages on a single long line separated by spaces. The information included in this line shall be inserted into a text file which is later presented to a user. ...
3
votes
1answer
735 views

Percent sign (%) in front of shell command

I just pasted a bunch of code into my shell, but forgot to remove the leading % before running the command. It appears to have done nothing. Why does this do nothing in my shell (zsh)? > % echo ...
0
votes
1answer
135 views

Linux find files in subdirectories by extension (.txz) then move them to specified directory using regular expressions [duplicate]

I have mirrored a directory from a server with a large number of sub directories, each of which contain a .txz package and the usual .txt and descriptor files. What I would like to do is the ...
72
votes
2answers
7k views

Is “ps -u” Really a Bad Syntax?

IMHO ps -u shows a very useful output, much better than ps -u $USER: $ ps -u Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ USER PID %CPU %MEM VSZ RSS TTY ...
0
votes
1answer
105 views

output of sudo -l confusing me

(habdbsync) NOPASSWD: ALL, (habdbsync) !/bin/sh, !/bin/ksh, !/bin/csh, !/bin/tcsh, !/bin/zsh, !/bin/bash, (habdbsync) !/bin/su, (habdbsync) !/usr/bin/ssh, !/usr/bin/scp, !/usr/bin/slogin (root) ...
3
votes
2answers
2k views

How to justify and center text in bash?

Newbie here. I'm looking for bash script to center and justify text. My script only works with one line of text. How would you improve it? #!/bin/bash COLS=$(tput cols) while true; do clear ...
2
votes
2answers
340 views

How to take control back on a separate process in Linux shell?

I just set up a Minecraft server on my VPS for my brother and I ran it with a bash script : sh ./server.sh& This way, the server is running and I can still work on the same command line with ...
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0answers
101 views

UEFI shell mode with no colon key

I have a newly built PC with a UEFI-enabled motherboard and I'm having trouble getting my DVD drive to boot into UEFI mode so I opted to boot into UEFI Shell to manually start the DVD in UEFI mode. ...
2
votes
1answer
139 views

Unexpected Bash glob completion uses first match even if ambiguous

If I have the following files in a directory: $ ls a-file-1 b-file-2 something-else And I type $ cat *file*<TAB> The line unexpectedly updates to $ cat a-file-1 | (pipe denotes cursor) ...
0
votes
0answers
15 views

How can I open a file with its associated default application from a networked drive via Shell on Windows?

I have a file Z:\test.txt. I can do "notepad z:\test.txt". But "start z:\test.txt" or just "z:\test.txt" gives me "Access denied". I have full read/write access to the share. How can I fix or work ...
2
votes
2answers
198 views

Grep in newest file

I'm trying to find a specific line from the newest file I have in subfolders. Files have the same name. So structure is like: Folder SubFolder1 filename.xml SubFolder2 filename.xml I'm ...
0
votes
2answers
4k views

FileZilla: Can I run a remote shell command via FileZilla client?

I have a very simple question. Can I run a remote shell command on the server via FileZilla client. For instance can I do a: tar -zxvf myarchive.tar.gz etc... (didn't think it was possible with ...
0
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0answers
256 views

Shell Script automatically exits from SSH section after switching of user (through pbrun command)

I have the below piece of code.. ssh some_user@server << EOF echo 'Successfully connected to the server' pbrun previlige -u user ls pwd id ...few more commands EOF if [ $? -eq 0 ] then echo ...
0
votes
1answer
25 views

What does ${file?my.file.txt} and ${file:?my.file.txt} mean in Bash?

When I read some tutorial today, I came over with the statements like ${file?my.file.txt} and ${file:?my.file.txt}, what do ${file?my.file.txt} and ${file:?my.file.txt} mean in Bash script?
1
vote
1answer
495 views

What is the difference between set, env, declare and export when setting a variable in Linux shell?

What is the difference between set, env, declare and export when setting a variable in Linux shell, like Bash?
0
votes
1answer
85 views

Why variables in shell are not inherited by sub-shell now that the sub-shell is implemented by fork?

When running shell command in shell scripts, a sub shell process is generated. Doesn't the process is generated by fork function? Why the variables that are not exported are not inherited? In fork, ...
1
vote
2answers
92 views

Bash parameter Expansion: Best practices for speed?

I was just wondering if anybody knows any best practices or if there is any documentation about this topic: The scenario is searching / grepping in the log files. To make my point I will use ls. So ...
0
votes
3answers
80 views

Linux hosting with web-based shell access

I am looking for a service that gives user some computing resources, a Linux OS and a preferably web browser based shell access. Are there any services that you can recommend? The bandwidth usage ...
0
votes
1answer
37 views

How do I recover from a `tmux a` by mistake within a tmux session?

I have a tmux session with a pair of windows. I want to recover the stdout from both those windows. I found this example, and so, within my existing attached session, ran tmux a. I now have a screen ...
0
votes
1answer
21 views

List folders by modification time of children in linux?

I have a folder, we'll call it /scripts/, that contains subfolders for a number of different scripts (let's say /scripts/file_export, /scripts/record_ingest, /scripts/stats). Inside these folders are ...
2
votes
1answer
60 views

Change puTTy presets via registry

I am fixing presets through the .reg file instead of in puTTy because I am going to make this an open source registry. Mostly changing themes, and my school doesn't know what the hell they are doing ...
2
votes
1answer
51 views

Pipe standard error to file and keep it on standard error?

I have a script (fragment) for which I'm logging output and standard error: #!/bin/sh #... { date "+%Y-%m-%d %T" cd $workdir ls -ltr validfile badfile #example command that provides stdout, ...
0
votes
0answers
23 views

detox not removing all whitespace

Here's a process that is giving me some trouble. Hope you can help: I unzip a file generated by system X. All files have white spaces interspersed in the file name. I use detox to remove the white ...
1
vote
1answer
92 views

Bash - list files within date range

So far I've been basing my efforts around this blog and have come up with: startdate=”201407010000? enddate=”201408010000? touch -t $startdate ./startdatefiles touch -t $enddate ./enddatefiles find ...
0
votes
0answers
31 views

Batch arguments for SSH Secure Shell in Windows 7?

I installed SSH Secure Shell to connect to my remote server, and I want to automate the process of updating my website. I was going to make a batch script to automatically push and pull from my site ...
1
vote
0answers
28 views

How can I efficiently filter Dos packets? [duplicate]

I have recently been the victim of some Dos attacks. The facts : I received a very high amount of packets saturating my connection and preventing me from accessing the Internet during one hour ...
0
votes
2answers
72 views

How to make a copy of file in the same directory

This creates a file in the same directy as 'some.file.bak'. find /home/ -ipath "*/temp/some.file" -type f -exec cp {} {}.bak \; How to make a copy in another name such as 'another.file' in the ...
0
votes
1answer
20 views

Relative Path in Chain of Process Call

I have a Java program which executes a bunch of python and shell scripts, which in turn will call some other python/shell scripts. If I use relative paths in any of the scripts, would the paths be ...