The command-line is the interactive interface to your shell.
3
votes
0answers
40 views
How to change block device names, e.g. /dev/sdc to /dev/sdb?
Example of why this might be desired: I connect a block device, which shows up as /dev/sdb, and mount it. Later that device gets removed without being unmounted. The block device is reconnected, but ...
-2
votes
3answers
35 views
I only want part of the sentence. Is it posible to cut from the start to the end and only get the output i want?
My file:
<TextBlock x:Key="applicationNameSpectrumAnalyzer" Text="Booting Spectrum Analyzer"></TextBlock>
<TextBlock x:Key="applicationNamePowerMeter" Text="Booting Power ...
1
vote
1answer
28 views
PS1 from .bashrc overridden somewhere else
I'm trying to use a custom PS1 line, including colors and git repo information, on a Red Hat Enterprise Linux 6 machine. I have a predefined version I'm successfully using on other systems running ...
0
votes
1answer
49 views
Split a set of data to massives and find maximum for each
I have a set of data looking like this:
1 0.1
2 0.23
3 0.05
5 0.73
6 0.40
7 0.34
10 0.11
11 0.45
12 0.68
I need to split the set of data to massives using the rule that the next ...
3
votes
3answers
48 views
How do I cut a string already separated by spaces?
Lets say there's a string like this
test="1/2/3 4/5/6 7/8/9/0"
They are separated by spaces, as well as '/'.
I want to return a result like this by taking the second field of each string segment.
...
0
votes
2answers
42 views
can't delete a file starting with a '-' [duplicate]
i have a file is name
-ksh.l.15092015.log
to delete this file i do this:
rm -rf -ksh.l.15092015.log
but i have this error:
rm: Not a recognized flag: k
Usage: rm [-firRe] [--] ...
0
votes
0answers
8 views
Can't compile an example program from The C Programming Language [migrated]
I know programming in Java, but I'm reading "The C Programming Language", second edition. It says that to compile and run a program from the command line you have to do:
$ cc hello.c //assuming the ...
0
votes
2answers
48 views
what does 'tc@box:/home$' mean?
I was wondering what this means? I know that CD stands for change directory does this take me to the home directory, if so what does $ mean?
1
vote
1answer
10 views
How to verify IDEA installation success with CLI on a VM?
I'm using a third party Puppet module to install IntelliJ IDEA, and I'd like to automatically verify that the installation worked. The current solution fails because there is no license:
$ make test
...
-1
votes
0answers
37 views
How to make an alias available in current shell [closed]
I have an exercise that I have to create a file with an alias on it, and then if I call
source myFile it will make the "alias available in the current shell".
So for example I want to create
alias ...
0
votes
1answer
16 views
Is a “--silent” flag supposed to suppress warnings and errors, or just warnings?
I'm designing a terminal-based application, and I want to implement a --silent flag to suppress noise if they don't want it.
In this application, errors are most commonly logged when the application ...
0
votes
2answers
27 views
change permissions to a file and everything inside , recursively
So I want to create an alias called changeAllPermisions that accepts one parameter argument in such a way that when changeAllPermissions argument is called , both Group and Other do not have access to ...
0
votes
1answer
51 views
Automated file append with Bash script using expect [closed]
I am trying to write code for the past week to append text to a file using bash script. In order to automate this, I have added expect portions for sending input to the shell.
#!/bin/bash
#
# ...
1
vote
1answer
27 views
How to Find, remove and show counter via SSH?
I want to run a command which searches for specific files, then removes them then show how many already is deleted. So far I was using:
find -type f -name "*.cache" -exec rm {} \;
but when I have ...
0
votes
2answers
43 views
rename multiple directories by adding one character [duplicate]
I have multiple folders named as follow:
Name1
Name2
...
Name9
Name10
Name11
...
I need to rename them using mv command into:
Name01
Name02
...
Name09
Name10
Name11
...
-1
votes
4answers
56 views
how to move back from a current directory
Hi if suppose I am curently here:
cd Desktop/kinectrobot/src/beginner_tutorials/src
and after that working in src i want to move back one directory
for example I want to go to beginner_tutorials.
...
0
votes
2answers
38 views
Use multiple commands in sed to insert text after string with special characters
I am having a little trouble trying to do a search and replace using sed in a config file.
I want to use multiple commands using the -e option to do the following.
Step 1: find the first occurrence ...
0
votes
3answers
43 views
How to search multiple search patterns from a file with grep
If I search for multiple search strings in grep : usually just do:
grep "search1\|search2" somefolder/*.txt
but, what if I have 100 or more search strings? Can I say like this:
grep ...
1
vote
1answer
34 views
umask vs -m, --mode command options
Is there any technical merit/necessity to numerous *nix commands (mkdir, mkfifo, mknod) having a -m (--mode) option?
I ask this because near as I can tell, umask (both the shell command and the ...
2
votes
6answers
70 views
checking the largest number of a specific folder
Inside one of my folder I have a lot of files looks like enum-*
$ ls
PRIM enum-00020 enum-00040 enum-00059 enum-00078 enum-00101 enum-00122 enum-00141 enum-00160 enum-00179
...
1
vote
2answers
49 views
Print the first and last match of a field with awk
I have a tab delimited file:
qrs John tuv
abcd Sam efgh
ijk Sam lmnp
abcd Sam efgh
ijk Sam lmnp
qrs John tuv
I am trying to print the line in which the ...
0
votes
1answer
15 views
Production ready derivative from LFS
I've recently started delving into LFS and have been wondering if there are any popular or well-used distros that have been derived from LFS or BLFS. There are a few of completed projects on Github ...
0
votes
2answers
50 views
What is the command in linux, or a utility to know the current comand status (process status)
For example when I write telnet abc.wtf the telnet session begins saying trying to connect so and so IP, but is there a command that I can type in and know what is the current process happening to ...
0
votes
1answer
27 views
I want to delete from particular words in all the line if that particular word is present
eg:
CREATE VIEW AIPKEYITEM.SEASONGROUPNETSALES (
CALENDARID ,
PRODUCTGROUPID FOR COLUMN PRDGRPID ,
NETSALESDOLLARS FOR COLUMN NETSA00001 ,
NETSALESUNITS FOR COLUMN NETSA00002 )
AS
SELECT
...
0
votes
3answers
57 views
print last line of !! command
so I want to be able to print helloworld using the !! command. I tried creating a text file with the text helloworld on it. Then I say
cat textFileName
It prints helloworld. Then I say
!!
and it ...
4
votes
2answers
125 views
How to set custom resolution using xrandr when the resolution is not available in 'Display Settings'
I'm a new Linux user trying to change the screen resolution as there is no option under display. I have successfully managed to add new resolutions by fluke by following online guide. I don't have a ...
0
votes
2answers
59 views
Linux command to display the contents of a given file byte by byte with the character and its numerical representation displayed for each byte [closed]
I am looking for the Linux command and option combination to display the contents of a given file byte by byte with the character and its numerical representation.
I was under the impression that in ...
1
vote
2answers
29 views
Change terminal text color for next command only
So when I find myself compiling a lot (from the terminal) I find it difficult to distinguish between the current compilation results and the old ones, so I was wondering if there is a bit of text that ...
1
vote
3answers
50 views
Deleting all files except folders within directory
I am still pretty new to terminal based commands but while I was doing a rsync command between remote and local, I have accidentally 'copied' the files to the wrong place (Eg. /serA/items) instead of ...
2
votes
2answers
61 views
How can I compare two files and create another file that aren't in first file?
file1 contains:
100
200
300
400
file2 contains:
500
600
700
200
300
Expected output file will be:
500
600
700
1
vote
1answer
28 views
OSX: Delete all matching certificates by command-line
Using shell script to delete all matching certificates.
I found a list of certificates using:
security find-certificate -c "certificatename" -a -Z|grep SHA-1|awk '{ print $NF }'
Output is like ...
2
votes
1answer
30 views
Merge text files with 1st column and difference in output file
File 1: (text1.txt)
Row_Added_Ts Count
01/01/14 2022448
02/01/14 8345155
03/01/14 8663852
04/01/14 6785739
05/01/14 5279913
File 2: ...
1
vote
3answers
83 views
Is there a way to undo a terminal command?
I just copied a whole directory into another one using
cp ~/local/* ./
and actually wanted to type
cp ~/local/srl* ./
so I'm founding myself with a lot of unnecessary files. I can suppress them ...
1
vote
2answers
24 views
Can I pipe clipboard content to browser for viewing?
Here is the situation.
I often have to read chunks of information from large plain text files. I am planning to use Readability extension for formating the content to make it readable on screen.
0
votes
2answers
28 views
Wrong zip command messed up my project directory
I've issued a command gzip -r project.zip project/* in projects home directory and I've messed things up; every file in project directory and all other subdirectories have .gz extension. How do I undo ...
0
votes
1answer
27 views
extract subfolders outside and rename if necessary
I have a directory looks like:
dhcp-18-189-47-44:CE-06-new-stuctures_backup wenxuanhuang$ ls
DFT-00001 DFT-00004 DFT-00007 DFT-00010 DFT-00013 DFT-00016 DFT-00019 DFT-00022 DFT-00025 DFT-00028 ...
1
vote
0answers
21 views
List `yum/dnf` history in ascending (reversed) order
When you run yum history (or dnf history) it will give you the list of action starting from the last, most recent action being on top of the list. In case you have a lot of history steps your recent ...
15
votes
2answers
564 views
What does CTRL+4 (and CTRL+\) do in bash?
I just found out by accident that CTRL + 4 closes programs reading stdin input from the command-line.
This is how it looks when I type CTRL + 4 or CTRL + / into programs reading stdin
ryvnf:~$ ...
1
vote
2answers
57 views
How to use ln -s to create a command line shortcut?
I have an sh file that I would like to be able to open from the terminal at any time. I would like to type "studio" into the terminal, and have android studio open
I recall using ln -s to do this, ...
1
vote
3answers
57 views
Command line to go in directory passed by which command
I want use a command such as this :
which node && cd $_
to jump in the directory when the binary file reside, but the which command return all the path + name of binary ,so i get an error ...
0
votes
1answer
23 views
How to find what the “Mate version” of programs are called
On Mate systems, many programs correspond to (and are sometimes forks of) other programs with more well-known names:
nautilus -> caja
gnome-terminal -> mate-terminal
ark -> engrampa
gedit -> pluma
...
1
vote
2answers
168 views
What command should I use to move these particular elements?
Here is my initial situation:
In a folder named for example Father, are stored some files in the following way: Father contains 24 children folders (let's call them Child1, Child2, ...), and each one ...
2
votes
2answers
63 views
adding column in CSV file using awk
I need to a add a column in CSV file from an array using awk.
For example,
input.csv
a,10
b,11
array = (100 200)
output.csv should look like
a,10,100
b,11,200
I tried this command but it does ...
1
vote
2answers
41 views
linux terminal transfer control to new terminal [closed]
in one of my shell program, I want start an xterm window from terminal and then the control of next execution should go to the newly opened window (by default the control will be in the terminal). ...
0
votes
1answer
28 views
How to run bunch of hierarchical dummy shell processes (process of another process, etc.)?
I would like to run multiple processes where each process is running another one, so it will create a long process branch.
I've tried:
$ bash -c '(bash -c "sleep 20"); sleep 20' &
$ pstree ...
0
votes
1answer
77 views
SED - Find and replace with special characters (#, , % )
I'm aware that this is a really simple question, but I'm struggling to find a solution to this .
I need to automatically find and replace in the /etc/aliases file the following section:
# Person ...
3
votes
3answers
55 views
Find a pattern and insert # at the beginning of 2 line befoe that and 1 line after that
I have a big file (more than 2000 lines). Where i have to insert a # at the beginning of 2 above lines and at the beginning of 1 below line after finding a pattern. Also insert # at the beginning of ...
5
votes
3answers
130 views
Retreat from deleted directory
Suppose I am editing some files. I have (say) a terminal open and a gui file manager.
I am currently in /my/very/long/and/winding/directory/path in the terminal.
In my gui, I delete
...
0
votes
1answer
63 views
How to grep the following lines from a file?
I have a file which has the names of many files in a directory in the following format:
A20150824.0950-0955_jambala_CcnActiveSessionCounterJob
A20150824.0945-0950_jambala_CcnActiveSessionCounterJob
...
2
votes
1answer
41 views
Openssl passing a binary pass phrase as a argument
This openssl command is working fine for me.
openssl aes-128-ecb -d -in encrypted_base64.txt -K 4D1D75237C31E7732030C69F209F23154418373335E049C4F567C7B6D422ABD0 -base64
How would I do the ...
