Bash is the shell used in Ubuntu's command-line interface.

learn more… | top users | synonyms (1)

5
votes
1answer
37 views

Bash always evaluate Regex as true

In a script, there's these lines #!/bin/bash ... if ! [[ $SCREEN_NAME =~ ^[a-zA-Z0-9_.-]+$ ]]; then echo "The Server title contains invalid symbole. Only a-z A-Z 0-9 - _ . are allowed" exit 1; ...
1
vote
2answers
25 views

parsing out in bash

my file looks like this // [297]((((21:0.125204,20:0.125204):0.00994299,(28:0.0790047,(7:0.0146105,5:0.0146105):0.0643943):0.0561423):0 segsites: positions: 1 2 4 6 9 10 45 67 78 89 ...
2
votes
1answer
135 views

How to automatically answer interactive cli program (not script) with bash script?

I've googled this, and almost all I could find is to answer a bash script and this doesn't work for me. The answers I found told to do: echo "yes" | ./script or ./script <<< yes or ...
1
vote
2answers
32 views

Help with reminder script in Bash

I have stacked trying to make a simple reminder script which can compare the running date with the date that a file has. for example I have a file that contains: Apr 25 2015 cycling \n Apr 26 2015 ...
2
votes
3answers
2k views

“ bash: /usr/bin/mint-fortune: No such file or directory ” - Ubuntu 14.04

Previously i used LMDE on my laptop, but now I moved to Ubuntu. I might have been a little bit rough with it, because I’ve simply format / partition, and installed Ubuntu on it. Home folder was ...
5
votes
5answers
208 views

How can I edit a range of text between 2 symbols? awk, sed, regex

Using the "*" symbol, (doesn't have to be that one, any special character will do in order to indicate), how can I edit the text from this: *berry straw rasp blue boysen * blahblah blahblah blahblah ...
13
votes
5answers
825 views

Where are commands `fg`, `bg` and `jobs` installed? [duplicate]

fg, bg and jobs are used for job management. And for some reason (maybe it's just me), I'm not able to find where their binaries are nor their manpages (whereis prints no information). which gives no ...
1
vote
1answer
71 views

bash: ./name.exe: Permission denied

I want to execute a program in Ubuntu 12.04...but when I type ./programname.exe it makes error: bash: ./gbat.exe: Permission denied and I typed "chmod +x programname.exe" , but it doesn't fix ...
1
vote
1answer
29 views

Why does the more command not work when bound to a keyboard shortcut?

I have two commands that both work in terminal: notify-send "$(more /home/tim/autest.sh | head -1)" and notify-send "$(cat /home/tim/autest.sh | head -1)" putting them in a script like this: #! ...
0
votes
1answer
24 views

How to run bash commands in gnome-pie app launcher

I recently installed gnome pie app launcher and i was trying to edit the individual slices and run a bash command to open eclipse. i'm running the more updated eclipse that i downloaded from ...
18
votes
2answers
7k views

In a bash script what does a dot followed by a space and then a path mean?

I came across this example when trying to mount a usb device inside a openvz container and I have never seen the construct in the second line before. Can you explain what it signifies? #!/bin/bash . ...
2
votes
4answers
267 views

Bash script to rename files in a directory

I am trying to write a script that takes a directory as a command line parameter and iterates over the files in the directory changing their extension to .bu I thought this would work but I'm getting ...
1
vote
1answer
24 views

Running Shell Script on Double Click

Okay, I have opened nautilus and edited preferences to ask when I double click an .sh script to run in Terminal. Well, I don't want to use a .desktop file; I want to just simply double click on the ...
7
votes
2answers
232 views

How to use grep output as a path for cd?

How can I pipe grep output as an argument to the cd command? For example: [root@xxx xxx]# pip install django | grep '/usr.*' Requirement already satisfied (use --upgrade to upgrade): django in ...
16
votes
3answers
1k views

“mv file” and now it's missing

In a terminal window, I typed: mv filename ..\.. [Note the wrong slash.] Now I can't find it. Gone. I ran some searches and looked through recoverable deleted files. Nothing. Poof. Serves me ...
1
vote
1answer
21 views

My keyboard shortcut binding does not work with my script

I was trying to bind a keyboard shortcut to my script. I tried binding it to keyboard shortcut from System Settings>Keyboard>Shortcuts>Add Shortcut I added new shortcut and as mentioned in ...
1
vote
3answers
120 views

What is the syntax for IF/ELSE in bash?

I am trying to pull logs and doing few others things directly. written a small line BASH but not working. I am sure thats with IF Condition. sed -rne '/21:25:07/,/21:50:07/ p' ...
4
votes
1answer
84 views
+150

How to log bash history by editing bash source?

I'm using bash-4.3.30. I need to log all my commands history on a single file. I can do that by editing the bashrc or bash_profile but I'm not going to do that. I want to play with bash source ...
11
votes
4answers
4k views

How do I set the prompt to use two colors?

One thing I liked about Mint was that the terminal would usually show two colors: everything from the left to the $ would be one color, and everything past the $ would be another. Is there a way to ...
3
votes
2answers
53 views
+50

How to run a script when a directory is changed by another user?

I know has been a bit of discussion about topics similar to this. But here is what I am basically trying to do. I have a watch directory called watched and whenever a file is added to that directory, ...
0
votes
1answer
22 views

Trouble with pip on 14.04

I am trying to install a few different things and having issues. I thought pip could have been the issue on one of the packages I was trying to install. So I decided to try to upgrade pip, following ...
3
votes
1answer
135 views

gnome-terminal can't set 256 color support correctly with or without tmux

I've been trying to set up 256 color support correctly for quite some time but it seems to never work for me so I'm not even remotely sure what I'm doing wrong. How it looks in the terminal vs gVIM: ...
1
vote
2answers
47 views

Running a command in screen daemon mode

I am trying to run a command in screen mode using the command screen -dmS screen_name sed -i 's/a/b/'g some-file.txt Nothing happens. When I put the same command in a script and run the command: ...
6
votes
6answers
292 views

Exit terminal after running a bash script

I am trying to write a bash script to open certain files (mostly pdf files) using the gnome-open command. I also want the terminal to exit once it opens the pdf file. I have tried adding exit to the ...
4
votes
3answers
199 views

How to use double substitution in awk?

To print the fields at 29th column in two files I used paste <(awk -F, '{print $29}' PreRefFile.csv) <(awk -F, '{print $29}' Txlog.csv) This worked fine. To print all the fields starting from ...
17
votes
6answers
50k views

How to determine whether a process is running or not and make use it to make a conditional shell script?

How can I determine if a process is running or not and then have a bash script execute some stuff based on that condition... For example: if process 'abc' is running, do this if it is not running , ...
1
vote
3answers
4k views

Run .sh script on Ubuntu without using terminal

I'm using Ubuntu and I've created a simple script file: #!/bin/bash cp /home/guilherme/pictures/*.jpg /home/guilherme/backup When I run it on terminal typing the command "./script.sh" it works ...
6
votes
2answers
49 views

Differences between “<command> & disown” and “nohup <command> & disown”

This is my understanding about the usage of &, disown and nohup: <command>: runs the process within the Terminal's current bash instance, in the foreground (i.e. the process is listed as a ...
3
votes
3answers
134 views

Batch rename using a .csv

I have 700 folders that I want to rename. All these folders together are located in one single folder. I know the locations of all the folders on disk. I also have the folder names in a data sheet. ...
18
votes
5answers
13k views

Script to display all terminal colors

Throughout the internet I have seen many people with scripts that prints out a bunch of stuff in all the colors defined in ~/.Xdefaults. However when I try to use these, I always get error: Bad ...
-1
votes
0answers
24 views

After changing Ubuntu 9 version to ubuntu 12.04.If i run my code i get core dumped segmentation fault

After upgrading from Ubuntu 9 to ubuntu 12.04, when I run my my shell (below) I get a: core dumped segmentation fault This code used to work before. My C-based applications still work. #! ...
1
vote
3answers
45 views

Get Parent ID of last process executed in terminal

back to this How do I find the PID of the last open file in terminal? I want to know the PPID (parent id of the process) of the last executed process.
25
votes
3answers
34k views

Why does “ps aux | grep x” give better results than “pgrep x”?

I've just tried the following command on my Ubuntu, it doesn't show a thing: pgrep php5 shouldn't it return the process id of php5(which the following command just does)?: ps aux | grep php5 So, ...
0
votes
1answer
37 views

How do I find the PID of the last open file in terminal?

How to know the PID of the last open file (process) using the command line?
2
votes
0answers
18 views

How to check the password entered is a valid password for this user?

The scenario: In a bash script, I have to check if a password given by a user is a valid user password. I.e suppose I have a user A with password PA.. In the script I asked userA to enter his ...
2
votes
3answers
157 views

Error when running script in bash

I wrote a script in bash to basically create aliases, but for any reason, it doesn't work in some cases. Here it's the code: #!/bin/bash #Script to create unique and permanent aliases _add_alias() { ...
5
votes
1answer
86 views

What do these commands from a shell script do?

I'm just starting to learn bash. I have the following script, and I would like to know what does the following commands do in order to start to understand a little bit this world. if [ ! -w "." ] ...
0
votes
3answers
26 views

Problem when trying to run shell script : No such file or directory

I'm trying to run the following command on bash: ./home/abcdef/Desktop/jikesrvm/dist/prototype_x86_64-linux/rvm which is giving me a bash: ...
2
votes
1answer
119 views

How do I use the “^” and “$” symbols with regular expressions in a bash script?

How do I use the "^" and "$" symbols with regular expressions in a bash script? Please give me an example using both symbols.
0
votes
1answer
28 views

.bashrc edit messes up terminal command arrow-up history print

I wanted to give my terminal prompt in Ubuntu a more personal look, and wanted to change the text prior to the '$' when writing a command. From what I've found this is done by editing the .bashrc ...
2
votes
2answers
4k views

How do I list word count in multiple files?

Say I need to find out how many words are in each file that have the word 'work' in it. I know that to find files with 'work' in it, it would be ls work. And to figure out the number of words it ...
-1
votes
1answer
44 views

How to create logfile for a bash script?

I've written a bash script that runs multiple instances of a program and would like to write the entire output of the script to a logfile. I tried #!/bin/bash touch <.../somewhere/logfile.log> ...
3
votes
3answers
97 views

Can I call a .cpp program in Bash?

I am new in Bash programming. I want to call my C++ program in Bash file. My program is myProg.cpp: #include<iostream> using namespace std; int main() { cout<<"Salam! ...
1
vote
1answer
24 views

bash file for managing public private and history of website

I have a website and i have 3 versions I have the beta version with the most recent and usually not fully working changes. I have the public site that is on www. lastly, i have the history that I ...
0
votes
1answer
25 views

Unable to run apt-get with proxy even after setting the environment variables

I was trying to configure proxy in my lubuntu 14.04. Since I wanted to use the username and password for my proxy authentication, I opted ntlm and installed it. Now I can use my proxy link as ...
11
votes
4answers
28k views

How to round decimals using bc in bash?

A quick example of what I want using bash scripting: #!/bin/bash echo "Insert the price you want to calculate:" read float echo "This is the price without taxes:" echo "scale=2; $float/1.18" |bc -l ...
29
votes
2answers
117k views

How to use variables in 'sed' command?

I try the fallowing code and it does nothing var1=QQ sed -i 's/$var1/ZZ/g' $file However this code replaces QQ with ZZ sed -i 's/QQ/ZZ/g' $file How to use variables in sed?
0
votes
3answers
2k views

Command to run GUI Frontend for apt-get update

I want know, if there is any command to run apt-get update in GUI like in the picture following: All i want to do is to write a script which will update the software sources through this gui ...
0
votes
1answer
13 views

having elevated priority and general @audio permssion in rc.local

I am trying to run jackd instance from /etc/rc.local (along with a few other applications) from a custom made init script. The system is ubuntustudio and I have setup everything to have elevated ...
0
votes
2answers
74 views

Enforce a shell script to execute a specific python version

Update. Changing the alias unfortunately does not work. I have changed the alias to alias python='/usr/bin/python2.7' however the shell script still runs the python script in 2.4.3. Muru - I am ...