Questions tagged [command-line]
This tag is for questions that are about using the command-line interface (CLI), including the use of standard command-line tools and shell commands. However, for questions that are specific to each shell (like Bash, ZSH etc.), use the tag of that particular shell as well.
22,841
questions
4
votes
1
answer
817
views
Problem manipulating text using grep
I want to search for a line that contains log4j and take 7 lines before and 3 lines after the match.
grep -B7 -A3 "log4j" web.xml
After that I want to add comment tags before this paragraph and ...
- 5,413
4
votes
1
answer
194
views
How to install "bought" softwares from the command line? [duplicate]
I love doing things the command-line way and need to install some proprietary softwares that are available free of cost but have to be "bought" from the software center:
How do I install such ...
- 27.7k
4
votes
4
answers
17k
views
"/proc/partitions not found" error is showing up
I am configuring a webserver in Ubuntu 10.04. More particularly I am installing DataStax OpsCenter.
Unfortunately, the logs are spammed with this error:
ERROR [pool-3-thread-7] 2013-02-15 22:04:34,...
- 143
4
votes
1
answer
897
views
Terminal TTY Ctrl-Alt-F# not working, only prints junk characters
I'm not sure what I pressed to mess this up. I was on tty1, but it doesn't look like I'm on tty1 anymore. When I press any key on the terminal it just prints weird letters. Pressing Ctrl-Alt-F1 ...
- 4,557
4
votes
4
answers
3k
views
How to start/stop downloads in Azureus (Vuze) via terminal?
I need to stop/start download through shell script in Azureus(Vuze).
I know there is CLI and I can invoke it as
java -jar Azureus2-XXX.jar --ui=console
The ? will show a list of commands I can use. ...
- 11.7k
3
votes
4
answers
4k
views
What happens if we do rm -rf ../**? Can we restore the data?
I did something like:
$ cd /A/B/
$ rm -rf ./*
$ rm -rf ../**
Due to network issues my system disconnected from Ubuntu. When I came back there were no files or folders in the /A folder.
- 39
3
votes
5
answers
8k
views
How to get the location of a program in Ubuntu terminal?
How to get the location of a program in Ubuntu? For example I have Oracle, how to get the folder racine (location) of Oracle?
- 57
3
votes
6
answers
10k
views
Use bash to extract number from between square brackets
My file looks like this:
[581]((((((((501:0.00024264,451:0.00024264):0.000316197,310:0.000558837):0.00857295,((589:0.000409158,538:0.000409158):0.000658084,207:0.00106724
):0.00806454):0.0429702,(((...
- 716
3
votes
4
answers
25k
views
How to uninstall softmaker freeoffice
I downloaded FreeOffice from here.
Now I am trying to uninstall it by doing this command:
sudo dpkg -r softmaker-office
And it isn't working.
- 127
3
votes
4
answers
64k
views
permission denied while making a file without asking for password
I'm trying to create a file using cat > list but each time it shows me "Permission denied".
xyz@jaishreeram:/home$ sudo cat > list
bash: l: Permission denied
xyz@jaishreeram:/home$ sudo cat >...
- 71
3
votes
3
answers
138k
views
cd.. and cd- commands not found - how do I use the cd command?
I am using Precise pangolin. As far as I know, commands like
cd..
or
cd-
are used to browse through folders in the terminal.
But whenever I enter one of this commands, it gives an error saying ...
- 505
3
votes
4
answers
2k
views
Is there any way at the bash command line to compute multiplication and division so that the first 3 digits after the period appear?
I currently use the following to compute the following at the bash command line with commas every three digits:
printf "%'3.f\n" $(((29246636)*4096))
119,794,221,056
The equation needs to ...
- 141
3
votes
3
answers
3k
views
How do I suppress GtkDialog warnings in zenity and yad using Bash redirection in a script?
I'm trying to suppress GtkDialog warnings in zenity and yad:
$ zenity --error --text hello
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Error redirection and ...
- 102k
3
votes
4
answers
2k
views
Automate counting the number of occurrences
I want to know that how many times 'ABCD'(file A) comes in DB (file B). Likewise I want to know about every singe line present in file A against DB. I need an automated command which can ease my work ...
- 571
3
votes
5
answers
2k
views
Extract part of a line upto a particular string
Let us assume I have a file with lines like:
/java/jdkxx/jvm_jdk/bin/opt
/java/jre/jre_jvm/bin/opt
/foo/bar/bin/other/stuff/here
Is there a way I can extract part of the lines upto bin. I mean, ...
- 102k
3
votes
3
answers
1k
views
shell script to remove files didn't work
I want to delete multiple images having resolution less then 228x228.
For that, I wrote this shell script:
#!/bin/bash
for i in $( ls ); do
if [$(identify -format "%w" $i) < 228] && ...
- 6,890
3
votes
2
answers
9k
views
pipe stdout to zenity notification
I would like to pipe the stdout of shutdown -P +60 to zenity --notification. But this does not work:
sudo shutdown -P +60 | zenity --notification
user577728
3
votes
5
answers
4k
views
How do I make the shell to recognize the file names returned by a `ls -A` command, and these names contain spaces?
This is the part of the script I am using to rename the files returned by ls -A:
for FILE in `ls -A`
do
ext=${FILE##*.}
NUM=$(($NUM+1))
NEWFILE=`echo $2_$NUM.$ext | sed 's/ /_/...
- 1,360
3
votes
2
answers
88k
views
Bash return permission denied error when I redirect the output of ls to a file [duplicate]
I'm currently studying shell commands, one of the exercises consists in creating a structure with various directories and subdirectories.
I wrote ls -laR > hello, it was supposed to create a text ...
- 55
3
votes
3
answers
174
views
Why do bad requests take so long?
I noticed this is other OSes as well, but most visibly in Ubuntu Linux. Whenever a good request is made, it is computed practically instantly. However, whenever a bad request is made (a bad password, ...
- 1,165
3
votes
3
answers
15k
views
Command not found $ (dollar sign)
Any command that starts with $ returns
command not found
How can I fix this?
I am using 16.10 Ubuntu.
- 55
3
votes
3
answers
24k
views
cron error: bad username
I've basically re-written the terminal output instead of appending a series of edits to this question:
root@doge:/etc/cron.d#
root@doge:/etc/cron.d# tail /var/log/syslog
Dec 21 11:35:01 doge cron[...
- 4,551
3
votes
4
answers
26k
views
how to use sed to replace from last 3 characters from string
I have the issue to extract the x amount of characters from string and i have the difficulty enlarging the capability of the expression.
I have tried to use the sed command.
If i have the string ...
- 369
3
votes
3
answers
5k
views
Which terminal does Ubuntu use?
I've recently moved to Linux Mint, but I've always preferred the Ubuntu terminal over the xterm that is used in XFCE and KDE, can anyone tell me what it is called or where I can download it?
Thanks!
- 45
3
votes
4
answers
1k
views
Which respository does xvnc4viewer belong to?
I am using Ubuntu 20.04 and have a list of package names of which I want to check whether it is part of the default Ubuntu repository.
So far I am iterating over the list an check with the following ...
- 95
3
votes
5
answers
5k
views
A new command combining apt update && apt upgrade in 18.04 or some later beta?
If I'm not wrong there's a new command unifying apt update && apt upgrade in 18.04 or some later beta, with some argument -u or -d.
Am I correct, or there is something similar?
user423047
3
votes
5
answers
2k
views
Join two files, adding values in certain columns
How can I add another 2 values after matching the values from 2 columns in another file just like VLOOKUP?
Sample below. Value in column 6 & 7 from file1, when matched with column 1 & 2 from ...
- 115
3
votes
4
answers
5k
views
How to remove only the last forward slash in the field?
I have a json file where I need to remove the last forward slashes only. See the example:
{"url":"http://example.com/vary/file/","originalUrl":"http://example.com/vary/file/","applications":[{.........
- 1,548
3
votes
5
answers
3k
views
Is there any command in Linux which does not make a system call? [closed]
I was reading about system calls and I got a doubt whether any command runs without making even a single system call. If not then what is the command with minimum number of system calls? I used strace ...
- 116
3
votes
3
answers
1k
views
How to insert an ascii character in a line position?
I would like to edit a list of MACs in bl:ab:la:bl:ab:la format >> in to blab.labl.abla format. Each MAC is in a line.
I'm new in the use of AWK or SED but I'm almost sure that it can be ...
- 113
3
votes
4
answers
1k
views
Is there any way I can search in a file for Uptime that is greater than 100 days?
Is there any way I can search in a file for Uptime that is greater than 100 days via Linux Bash commands?
For example, file1 contains:
Uptime is 172 days
Uptime is 562 days
Uptime is 30 days
...
- 31
3
votes
3
answers
846
views
Bash script not recording
So, here i am, playing with some bash scripts, and there is something that doesn't work:
#!/bin/bash
script -c \
sudo apt-get update &&
sudo apt-get upgrade &&
exit
echo "(Not ...
- 55
3
votes
1
answer
17k
views
Bashscript making a variable equal a command. error command not found
Hi i keep getting the error
./imagehash.sh: line 2: =: command not found
When i know that i set the $CMD variable correctly (i tried the command outside the bash script and it worked just fine)
...
- 189
3
votes
2
answers
1k
views
What is the difference in running script with ./
What is the difference between running the script by calling directly its name and
calling the script by adding a with prefix of './' .
I can't find any difference in run time.
- 2,726
3
votes
2
answers
892
views
I need regex(7)'s manual, but man command shows regex(3)'s manual
I understand there are many manuals (which are displayed by man command) in Ubuntu that has same names and are distinguished by a number. For example there is regex(3) and regex(7).
If I type man ...
- 2,788
3
votes
7
answers
17k
views
How to select and print IP address from a set of strings?
I have a sentence whic contains an IP address. For example,
This sentence contains an ip number 1.2.3.4 and port number 50, i want to print the IP address only.
From the above sentence, I want to ...
- 2,233
3
votes
3
answers
6k
views
What are the common file extensions in Ubuntu?
Knowing file extensions really helps to understand what a program is doing or using. What are some common one's and how do I extract them?
- 11.4k
3
votes
3
answers
525
views
Remove apostrophe from multiple filenames
I'm new with Linux and I have the following problem. I have several different filenames like:
'Name1.mp4'
'Name2.mp4'
...
I would like to have the apostrophe ' removed from the filenames. Meaning, in ...
- 41
3
votes
3
answers
2k
views
Which character to escape for this to work in ~/.bashrc
I want to add this iostat command to my .bashrc and create an alias for it:
iostat -xk 2 $(findmnt -T ~ | awk 'END {print $2}')
I'm adding this to my .bashrc:
alias ios='iostat -xk 2 $(findmnt -T ~ | ...
- 31
3
votes
3
answers
9k
views
How do I make an html file with text in it in a separate directory from the one I'm in, all in one command?
Is it possible to create an html file with some text already in it, (I'll just use my name as an example) in a directory separate to the one you're in, all in one command? I'm very new to Ubuntu and ...
- 47
3
votes
2
answers
349
views
Use read line to iterate over variables
I have the following files:
$ ls *.png | egrep -i "am|pm"
output-0 11.42.30 AM.png
output-0 5.10.12 PM.png
....
I want to remove them but get this error:
$ ls *.png | egrep -i "am|pm" | while read ...
- 595
3
votes
2
answers
6k
views
How do I find which user executes the script when is used sudo?
What I want is to find the name of the user that runs bash script, when this script is executed by sudo. The only possible way, that I know, is to parse the output of who -m (who am i) in this way:
...
- 29.9k
3
votes
2
answers
6k
views
Remove a users right to use sudo [duplicate]
As an administrator, how can remove a users rights to use SUDO. Is there a simple command to do this?
- 143
3
votes
3
answers
18k
views
How to count number of process instances with bash?
Writing
ps aux | awk '{print $11}'
Gives me all the process instances, but how do I count them, is there a command that does that?
user194848
3
votes
5
answers
3k
views
How do I transpose a row to a column in a tab-delimited file?
I have a tab-delimited file with a number and the names belonging to the same number on the same row. The number and names are separated by a tab. The names are linked with each other by 2 underscores ...
- 367
3
votes
4
answers
57k
views
How to uninstall/install youtube-dl by using terminal
I installed YouTube-dl through Ubuntu Software Center, but now mine isn't working. So I can not able to Update and Install youtube-dl. I tried this:
$ sudo add-apt-repository ppa:nilarimogard/...
- 2,907
3
votes
4
answers
3k
views
Add to path only sh file not a dir
I have a bin folder with a bunch of sh files. For example "server-run.sh", "server-stop.sh", "server-do-something.sh". And I want to run file "server-stop.sh" from anywhere. I could add this bin ...
- 155
3
votes
5
answers
757
views
How can i fit 2 commands in 1 terminal shortcut
10 latest updates and drivers and I need to run a game called unreal tournament, but in terminal it requires 2 commands
The first one is to mount into the folder:
cd /usr/local/games/ut2004/
and ...
- 3,325
3
votes
4
answers
9k
views
Handle Doc/Docx Templates on a headless server to produce PDFs preferably without using OpenOffice.org
On a production web server I have to produce letters based on a template I got in MS-Word binary format. I use PHP and for the search and replace task I found PHPWord, which can handle Docx files, so ...
- 53