The command-line is the interactive interface to your shell.

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0
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1answer
13 views

Insert space at specified position in a file

I have this sample file: 234234|111||J1X0H8|SERP||R|D|666|M 234235|222||J1X0N5|SERP||C||555|M For each line, I need to insert a space after the 3rd character of the 4th column, like so: ...
1
vote
3answers
41 views

Removing mulitple lines

I am trying to write up a command line interfaces that will removes a particular section / lines of codes within a list of json files. By the way, the json file are located within the sub-folders of ...
1
vote
1answer
26 views

Save and restore terminal tabs with custom tabs title

I have a Terminal window with a dozen named tabs open *(gnome-terminal) I would like to save the current configuration and have it restored with names and directories. Is there a way to do this? I've ...
1
vote
1answer
34 views

How to run a command in background always?

the below command when I run from the terminal will keep posting the output to message.log cf logs broker-analytics > /var/www/cfbrokerlogs/message.log However, if i close my terminal it will ...
2
votes
2answers
53 views

Using the output of `grep` as variable in second command

I currently have 2 bash command line strings I use to gather data needed for a certain task. I was trying to simplify and have only one command used to gather the data without using a script. First I ...
1
vote
2answers
48 views

ls .. doesn't work properly with symlinks

I have directories set up a bit like this ~/code ~/code/src ~/code/build -> /path/to/somewhere/else That last one's a symlink. If I do this cd ~/code/build ls .. then I get the listing for ...
1
vote
3answers
205 views

How to copy files from the folder without the folder itself

I'm trying to copy files and subfolders from A folder without the A itself. For instance, A folder contains next: | file1.txt | file2.txt | subfolder1 Executing next command gives me ...
8
votes
2answers
398 views

Run another command before running the command the user wants to run

Let's say I want to modify the original behavior of the ls tool this way: $ ls Hello World file1 file2 ... How can I do this? When running ls I would like to run another command let's say echo ...
1
vote
2answers
171 views

Why does “grep '.*[s]' file” work and “grep .*[s] file” doesn't?

Comparing grep '.*[s]' file with grep .*[s] file Why do you need quotation marks to let this work properly? In the second case, grep seems trying to inspect every file with a period.
0
votes
3answers
31 views

Unable to use make to install Valgrind

I am attempting to download and install Valgrind using the following instructions: I get through step 3 just fine, but when I type make I get the message make: *** No targets specified and ...
1
vote
0answers
7 views

obexftp return code 97

I have been trying to send a file with bluetooth from my raspberry to my phone. I tried to use obexftp to do this but it gave me the return code 97. I have not been able to find out what this code ...
1
vote
1answer
28 views

Sourcing a redistributable script by default

I am creating a bash script which I wish to release on github. The script needs to access the command history but this is not possible without sourcing that script. I don't want users to put it in ...
1
vote
2answers
46 views

BASH: Command not running, special character '�' suddenly appeared (Ubuntu)

When I erroneously type 'ñ' (expecting to type any command) and then remove it and type the correct letter, the output returns the command with a special character attached �, obviously the shell ...
1
vote
1answer
25 views

Cannot remember the name of a CLI recorder software

I stumbled across a useful command line recorder that allows the user to copy the text when watching the 'recording'. I just cannot remember the name of the project. I just remember you can play and ...
3
votes
2answers
38 views

Tell gzip/bzip2/7z/etc not to compress already-compressed files?

I'm tarring up /home, and piping it through bzip2. However, I've got lots of already-compressed files out there (.jpg, .mp4, .mkv, .webm, etc) which bzip2 shouldn't try to compress. Are there any ...
1
vote
1answer
46 views

Service network restart same as ifup and ifdown?

Can service network restart take place of ifdown and ifup? I was managing my server the other day using SSH and I changed my internal IP from DHCP to static. After editing the config file I had to ...
0
votes
2answers
30 views

Tilde on unix:hpux and / or solaris

On Linux press F9 return a correct ~ On unix(solaris or hpux) return 0~ How to set correct tilde on those systems?
5
votes
2answers
199 views

ls -l /proc/self | increamental PID?

Each time, when the commandls -l /proc/self is executed, the link points to process who's PID keeps increasing. Why is this so ? Is it the PID of the ls command ?
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votes
2answers
31 views

What is a simple example where the use of the command line is unavoidable or better? [closed]

I want to see a simple example that motivates the use of the Linux command line. Like I want to see an example where the use of the command line will do it in seconds and on GUI , it will take you ...
0
votes
0answers
41 views

I can't open application [closed]

Today I installed cdrkit. I installed it with pacman. When I write cdrkit in the terminal it doesn't open, saying: bash: cdrkit: command not found When I use pacman -Qs cdrkit it shows me that app ...
1
vote
2answers
46 views

Formatting ifconfig using sed/awk

I'm using ifconfig on OpenSUSE. When I run ifconfig eth0 I get eth0 Link encap:Ethernet HWaddr CE:FD:75:DF:A5:6D inet addr:172.16.4.177 Bcast:172.16.5.255 Mask:255.255.254.0 inet6 ...
1
vote
2answers
31 views

Why does terminal say I have mail every time I open it?

I am using OSX 10.9.5 Whenever I open a terminal, it says something like: Last login: Wed Jan 21 10:29:13 on ttys002 You have mail. What mail is it talking about ? If I open the mail app, I have ...
1
vote
4answers
41 views

Two operations with sed on the same pattern

I use this following sed command for display names of files with a specific form: ls -1 *|sed 's/^\(.*\).png/\1\/\1,/g' If I have two files named BOH_Contour.png and BOV_Web.png, I obtain ...
0
votes
3answers
46 views

Count new lines in file last 1 minute

With bash, how to count new lines appended to file the last 1 minute? What would be smartest if you want to count new lines for the last 1 minute in multiple files simultanously and get output? I ...
4
votes
3answers
864 views

How to represent date format in '2015120' in Linux shell?

My colleague is generating log files with a preceding date format like 2015120, which represent January as 1 instead of 01. The usual way I'm using to deal with this kind of issue is using date ...
0
votes
2answers
47 views

Is there on Ubuntu a best way to execute a program than terminal command “./”

Is there on Ubuntu an best way to execute an program than terminal command "./". I have put PhpStorm into an folder and when I want execute PhpStorm, I must cd bin/ and execute with this command: ...
0
votes
0answers
9 views

How to mount Thunar's SMB mountpoint using command line

I have a mountpoint that defined by Thunar, as follows: /var/run/user/1000/gvfs/smb-share\:server\=10.7.7.254\,share\=myshare1/ How to mount that connection to that specified location without ...
1
vote
2answers
73 views

How do I get command name of the last executed command?

Example: I type man ls, than I want to get man only. By using !! I can get man ls but how do I get man?
0
votes
1answer
35 views

make custom commands on android 4.4.2

I want to program and debug in my android phone. To do that I downloaded c4droid and it's gcc plugin. after a lot of tries I understood that gcc is in directory ...
0
votes
1answer
38 views

timeout pipeline

I want to execute these two timeout command on the same command but with a different time and instructions. So timeout --signal=SIGINT 5s command timeout --signal=SIGKILL 10s command How to append ...
3
votes
2answers
108 views

Assign specific line from a variable to another variable

I would like to take a specific line from a variable to another variable. I tried this but it doesn't work: c="1.apple 2.banna 3.peach" read "Please choose fruit [1-3]:" t a=$c | awk "NR==$t" echo ...
-4
votes
1answer
61 views

Merge two csvfiles by column header

I have two csv files: success.csv "ID","Legacy ID","Field1", "Field2" 1,1111,google,news 2,2222,yahoo,news error.csv "Legacy ID","Field1","Field2","Message" 3333,aol,news,"Failed to upload ...
1
vote
1answer
44 views

Command prompt (PS1) including the number of files in directory (both hidden and regular entries)

I have finally come up with a favourite PS1 format but I find it takes too long to load. I need help optimizing... The part that is slowing it down is when I call the external commands in the prompt. ...
1
vote
3answers
37 views

How to express all files/directories at the extra -exec option of `find` command?

I have a task to copy all files from multiple directories with special names to a target directory. So I build this directory to test my command. The test directory tree looks like: . ├── dir1 │   ...
0
votes
1answer
46 views

Is there a way to see which user is logged into the system and has switched with “su”?

There are many person that may have access to the system and use a common user with more grants. How can I see which user is running a command? is there a way to use "ps" for that?
1
vote
2answers
34 views

Change icon for an application form command line?

Is there a way to change the icon of an application's window from the command line? For instance, I'd like to have separate icons for Firefox windows under different profiles (different processes), ...
0
votes
1answer
73 views

Using the cURL command, how does one fetch stock data which comes back *without* commas and spaces?

What can I add to the below script so that it fetches the stock data and brings it back WITHOUT any commas and spaces? For example GOOG Outstanding shares is 675,000,000. I desire the output of ...
1
vote
1answer
52 views

Using cURL command-line tool on Mac, how does one fetch stock data which comes back *without* commas? [duplicate]

The below script is not working. cd desktop/quoteUpdate while true do curl-o quotes.txt -s "http://download.finance.yahoo.com/d/quotes.csv?s=goog,aapl&f=sl1" sed -i '.bak' 's/,/ /g' quotes.txt ...
1
vote
2answers
46 views

`nl` invocation soaking all input before numbering

How can this be done? I don't see any applicable option in the manual. I have positively checked that indentation breaks after ten million lines. You can check it like: $ (for i in `seq 0 ...
1
vote
0answers
26 views

If I cancel when prompted for my Git password, I can no longer see anything I type, until I log back in [duplicate]

Everything still works (typing "exit", for instance, exits), but I can't see anything I type. There's not "funny characters", just nothing. Even re-running git and entering the password properly ...
3
votes
5answers
229 views

Awk - output the second line of a number of .dat files to one file

I have searched through previously asked questions and can't find an answer to what I am trying to do. note, I am new to linux. I have multiple files something like: (in reality i have 80) file1.dat ...
3
votes
3answers
128 views

Strip off word pattern at the end of string using sed

I have following string: ksh -x SCRIPT2.ksh $BUSSINESSDATE & PID=$!; ksh -x SCRIPT1.ksh $BUSSINESSDATE & PID=$!; I want to strip off the last word & PID=$!;. Desired result is: ksh -x ...
1
vote
6answers
64 views

using tee to output intermediate results to stdout instead of files

I know that to capture a pipeline's contents at an intermediate stage of processing, we use tee as ls /bin /usr/bin | sort | uniq | tee abc.txt | grep out , but what if i don't want to redirect the ...
0
votes
1answer
34 views

Searching a word from a specific dictionary file in sdcv(console version of Stardict offline dictionary)

I have recently installed sdcv(console version of Stardict offline dictionary) and have installed 5-6 dictionary files as shown here Whenever i search any word, using sdcv hello or sdcv cat , it ...
2
votes
2answers
75 views

Extracting values from a file keyed by multiple keys

Consider a file with key=value pairs, and each key is optionally a concatenation of multiple keys. In other words, many keys can map to one value. The reason behind this is that each key is a ...
13
votes
6answers
1k views

Is there another simple way to append line to end of file other than `>>`?

Recently I'm echoing short sentences to a tree_hole file. I was using echo 'something' >> tree_hole to do this job. But I was always worried of what if I mis-input of > instead of >>, ...
3
votes
4answers
100 views

How can I run a specific line as a command in a text file?

Sometimes I need to exec a single command which is in a shell script. I already know sed -n 'line_num p' can print that line. But how can I exec that printed out specific line as a command?
4
votes
2answers
338 views

Eject / safely remove vs umount

I'm using Ubuntu 12.04, and when I rigth click on a my flash drive icon (in the Unity right bar) I get two options that have me confused: eject and safely remove. The closer I came to answer was this ...
2
votes
4answers
90 views

Fastest way to read last line within pattern of multiple files with the same extension

I have in a directory /home/files/ some files that all have the same extension .txt. For example 1.txt 2.txt 3.txt 4.txt 5.txt test.txt These files are all the same in data format but the data are ...
2
votes
0answers
28 views

Help with basic programming [migrated]

This issue I feel is more my understanding of pointers but here goes. I am suppose to create a system program in C that performs calculations as such math operator value1 value2. Example math + 1 2. ...