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Regex find and copy in bash (preserving folder structure)?

- by Jonathan Sternberg

I have a folder with a bunch of log files. Each set of log files is in a folder detailing the time and date that the program was run. Inside these log folders, I've got some video files that I want to extract. All I want is the video files, nothing else. I tried using this command to only copy the video files, but it didn't work because a directory…

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"-bash: ls: command not found" error in Terminal on Mac. How to correct it?

- by logoin

I edited the .profile file to add a new PATH. I believe I set it wrong such that most commands become unavailable. Since I can't use ls or vi commands to edit .profile again, any idea how I can correct the error? Thanks!

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is there a way to switch bash or zsh from emacs mode to vi mode with a keystroke

- by Brandon

I'd like to be able to switch temporarily from emacs mode to vi mode, since vi mode is sometimes better, but I'm usually half-way through typing something before I realize I want I don't want to switch permanently to vi mode, because I normally prefer emacs mode on the command line, mostly because it's what I'm used to, and over the years many of…

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How do I test if a variable is a number in bash?

- by Flávio Amieiro

I just can't figure out how do I make sure an argument passed to my script is a number or not. All I want to do is something like this: test *isnumber* $1 && VAR=$1 || echo "need a number" Any help? UPDATE: I managed (whit Charles' help) to do it, but I'm not yet sure it's the best way to do that (even though it worked on my tests).…

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How to send a notification to another user with notify-send ? Bash

- by debugger

Hello all, notify-send display a notification box with the message that you want to display on your own machine. Is there a way to use notify-send to send a notification message to another user and display the message on his machine? Thanks

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Python vs Bash - In which kind of tasks each one outruns the other performance-wise ?

- by Doppelganger

Obviously Python is more user friendly, a quick search on google shows many results that say that, as Python is byte-compiled is usually faster. I even found this that claims that you can see an improvement of over 2000% on dictionary-based operations. What is your experience on this matter? In which kind of task each one is a clear winner?

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bash: hwo to know NUM option in grep -A -B "on the fly" ?

- by Michael Mao

Hello everyone: I am trying to analyze my agent results from a collection of 20 txt files here. If you wonder about the background info, please go see my page, what I am doing here is just one step. Basically I would like to take only my agent's result out of the messy context, so I've got this command for a single file: cat run15.txt | grep…

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What's the equivalent of the bash in windows batch?

- by symfony

while [1 = 1] do eject sleep 1 eject -t sleep 1 done And this is said to be the same: watch -n 1 eject -T What does it do?What's the equivalent in batch?

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How to change the value of value in BASH ??

- by debugger

Hello All, Let's say i have the Following, Vegetable=Potato ( Kind of vegetable that i have ) Potato=3 ( quantity available ) If i wanna know how many vegetables i have (from a script where i have access only to variable Vegetable), i do the following: Quantity=${!Vegetable} But let's say i take one…

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Bash Scripting: I want to open a set of .php files, and add line before html tag

- by Bashn00b

Hi guys, I have a set of .php files in a folder, I want to add text just before these lines: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" > What i want is to insert just before these…

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How to output an array's content in columns in BASH.

- by Arko

I wanted to display a long list of strings from an array. Right now, my script run through a for loop echoing each value to the standard output: for value in ${values[@]} do echo $value done Yeah, that's pretty ugly! And the one column listing is pretty long too... I was wondering if i can find a command or builtin helping me to…

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Bash script to insert code from one file at a specific location in another file?

- by Kurtosis

I have a fileA with a snippet of code, and I need a script to insert that snippet into fileB on the line after a specific pattern. I'm trying to make the accepted answer in this thread work, but it's not, and is not giving an error so not sure why not: sed -e '/pattern/r text2insert' filewithpattern Any suggestions? pattern…

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BASH: How to remove all files except those named in a manifest?

- by brice

I have a manifest file which is just a list of newline separated filenames. How can I remove all files that are not named in the manifest from a folder? I've tried to build a find ./ ! -name "filename" command dynamically: command="find ./ ! -name \"MANIFEST\" " for line in `cat MANIFEST`; do command=${command}"! -name…

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String Manipulation in Bash . . . Removing leading section

- by Kyle Van Koevering

This is probably a really stupid question...but how can I remove parts of a string up to a certain character? Ex.) If I have the string testFile.txt.1 and testFile.txt.12345 how can I remove the 1 and 12345? Thanks a lot for the help

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Why 0 is true but false is 1 in bash?

- by httpinterpret

false; echo $? The above will output 1,which is contradictory with all other programming languages I know. Any reason in this?

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BASH: How to count all the human readable files?

- by user1687406

I'm taking an intro course to UNIX and have a homework question that follows: How many files in the previous question are text files? A text file is any file containing human-readable content. (TRICK QUESTION. Run the file command on a file to see whether the file is a text file or a binary data file! If you simply count…

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How to retrieve the first word of the output of a command in bash?

- by Neuquino

I have a command, for example: echo "word1 word2". I want to put a pipe (|) and get word1 from the command. echo "word1 word2" | .... I don't know what to put after the pipe... Thanks in advance

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Bash: Is it ok to use same input file as output of a piped command?

- by Amro

Consider something like: cat file | command > file Is this good practice? Could this overwrite the input file as the same time as we are reading it, or is it always read first in memory then piped to second command? Obviously I can use temp files as intermediary step, but I'm just wondering.. t=$(mktemp) cat file…

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How to re-prompt after a trap return in bash?

- by verbose

I have a script that is supposed to trap SIGTERM and SIGTSTP. This is what I have in the main block: trap 'killHandling' TERM And in the function: killHandling () { echo received kill signal, ignoring return } ... and similar for SIGINT. The problem is one of user interface. The script prompts the user for…

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How to use the .* wildcard in bash but exclude the parent directory (..)?

- by Allan

There are often times that I want to execute a command on all files (including hidden files) in a directory. When I try using chmod g+w * .* it changes the permissions on all the files I want (in the directory) and all the files in the parent directory (that I want left alone). Is there a wildcard that does the…

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How do you run multiple programs from a bash script?

- by Betamoo

I am trying to write a .sh file that runs many programs simultaneously I tried this prog1 prog2 But that runs prog1 then waits until prog1 ends and then starts prog2... So how can I run them in parallel? Thanks

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Parallel processing from a command queue on Linux (bash, python, ruby... whatever)

- by mlambie

I have a list/queue of 200 commands that I need to run in a shell on a Linux server. I only want to have a maximum of 10 processes running (from the queue) at once. Some processes will take a few seconds to complete, other processes will take much longer. When a process finishes I want the next command to be…

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Bash: Continue script if only one instance is running.

- by Andrew

Hello, now this is embarrassing. I'm writing quick script and I can't figure out why this statement don't work. if [ $(pidof -x test.sh | wc -w) -eq 1 ]; then echo Passed; fi I also tried using back-ticks instead of $() but it still wouldn't work. Can you see what is wrong with it? pidof -x test.sh | wc…

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Can I use what I wrote on the shell (bash, cmd, irb, etc) in a script automaticaly?

- by El_Hoy

The general idea is pretty simple, I want to make a script for a certain task, I do it in the shell (any shell), and then I want to copy the commands I have used. If I copy all the stuff in the window, then I have a lot of stuff to delete and to correct. (and is not easy to copy from shell) Resume: I want to…

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How a script know his own name in bash?

- by debugger

I launch script.sh and inside it i want to know what is his name Is there a standard procedure to know the scripts name ? the idea is to be able to extract the name from teh full path + name contained in $0 Thanks

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