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

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

I've googled, and almost all I can find is to answer bash script and doesn't work for me. The answers I found told to do: echo "yes" | ./script or ./script <<< yes and something like ...
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2answers
55 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 ...
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5answers
380 views

Where are commands `fg`, `bg` and `jobs` installed?

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 ...
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1answer
22 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 ...
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4answers
263 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 ...
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1answer
21 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 ...
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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 ...
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1answer
24 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: #! ...
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1answer
20 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 ...
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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 ...
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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: ...
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3answers
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“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 ...
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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' ...
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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 ...
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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 ...
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3answers
44 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.
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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?
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6answers
288 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 ...
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1answer
67 views
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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 ...
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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 ...
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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. #! ...
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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: ...
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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.
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1answer
26 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 ...
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2answers
42 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, ...
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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
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1answer
24 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 ...
0
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1answer
12 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 ...
5
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1answer
85 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 "." ] ...
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1answer
43 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> ...
4
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1answer
141 views

Writing a program that will demo the $PS2 variable

I've been customizing my terminal prompt, and found that it's possible to change the "secondary prompt". However, I have no way to test the changes I make to this one so I was wondering if a simple ...
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2answers
46 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: ...
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2answers
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Rsync --delete option doesn't delete files in target directory

I'm trying to use the --delete option in rsync to delete files in the target directory which isn't present in the original directory Here is the command I'm using: rsync -avz --ignore-existing ...
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4answers
327 views

Get previous commands in Terminal that match the currently typed command [duplicate]

In some terminals you can do something like this... Type some command nmap -sn 192.168.1.1/24 Then go on to do other things in the terminal for a while. Then later you can type nmap and then ...
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1answer
34 views

Different shells on SSH and local

So I've got an Ubuntu 14.04.2 computer that has OpenSSH Server installed on it. Whenever I use the computer locally, through the terminal, if I run: ~$ echo $SHELL /bin/bash However, if I SSH into ...
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3answers
39 views

What does this egrep command do?

I run this command egrep "\" string_demo | wc -l I got output below: akshay@akshay-K53SC:~/shell$ egrep "\" string_demo | wc -l > abc > pqr > xyz > ">" will continue until I press ...
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purpose of bamf-2.index [duplicate]

What is the purpose of /usr/share/applications/bamf-2.index ? I have noticed the applications it contains are installed in my computer. But I don't think it contains the complete list. Because the ...
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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 ...
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1answer
28 views

Customize Colors for Bash Terminal

I found this nice color library called Solarize which promises to liven up my hacking experience with a color terminal. I am not where to add the Solarize files to change. I found some ...
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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() { ...
1
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1answer
44 views

How to remove all lines in a file containing a string from another file

I want to remove all lines in a file containing a string from another file. So I don't want to remove the lines which are identical, there are none, but remove all lines if they share a string from ...
5
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3answers
216 views

Count down script is not working

I am trying to create a script that will count down to 0 from what ever number I give it. Below is my script and basically nothing happens, no error message, I merely get the standard command line ...
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0answers
25 views

speech-dispatcher always stop working after terminal exit?

In a previous question I made this line: trap 'clear; ~/ascii3.sh; spd-say "Exit"; sleep 2' EXIT The content of ascii3.sh is: echo -e "\033[01;31m" echo " _ _ __ _ _ ____ __ __ _ ...
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1answer
22 views

How to stop renaming a file which was already renamed using loop in shell script

I have a directory name dir1 containing another directories named 1,2,3,4,5. Now I want to rename directory 1 with 4, 2 => 5, 3 => 6, 4 => 5. but my problem is using mv command in shell script ...
1
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1answer
16 views

heredoc variables between underscores

Say I have something like this, tee filename <<EOF ... access_log /srv/users/serverpilot/log/$APP_NAME/$APP_NAME_nginx.access.log main; ... EOF where $APP_NAME is a variable. Bash ...
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1answer
30 views

sed to execute a command as replacement with substitution pattern as argument

I am trying to replace time in a log file by: cat mlog.log | sed -e "s/^[0-9\.]*/\$(date -d @&)/" Why it always first execute $(date -d $&) but not doing replacement at first and then ...
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1answer
42 views

USB mouse on Ubuntu stops working [duplicate]

Many times my mouse USB suddenly stops working, though the trackpad works just fine. I have to click it to make it work again. I have found the following solution: sudo bash for i in ...
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25 views

Running a bash script on “Switch User”?

I've had my first dabble with bash and got a working script going for each user on session start which checks if a NAS share is mounted and if it is unmounts it and mounts as the current user. This ...
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3answers
35 views

Force “bad” (not 0) return code of terminal command?

I have a framework written in python, and for testing purposes I basically want to do a subprocess (aka shell call) ... that should simply come back with a RC != 0. I tried to invoke some non-existing ...
2
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3answers
133 views

How to run a bash script after 20 sec on Login?

I want to run a bash script like: #!/bin/bash echo 'cpu limit bomi player at 40%' cpulimit -v -e bomi -l 40 Just 20 seconds after Login into my user. Can you please help me to do that? ...