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

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0
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3answers
80 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
951 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
188 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
74 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
88 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
80 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
55 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
129 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
201 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
78 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
62 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
48 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
74 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
135 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
91 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
59 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
27 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
440 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
441 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
108 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
139 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
117 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 ...
14
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
133 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
516 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
117 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 ...
3
votes
1answer
106 views

bash runs out of memory

This question is a fork of this SO question. Here is the MCVE version: $ PS1='Parent-$ ' Parent-$ type seq seq is /usr/bin/seq Parent-$ bash $ PS1='Child-$ ' Child-$ for i in $(seq 1000000000); do ...
1
vote
1answer
81 views

Is there any command in linux which will force linux machine to not shut-down

I have a very important process which is having a Queue, In Queue i'm storing important data and when if someone trap that process it must have to process the data which is there in the Queue after ...
3
votes
1answer
70 views

What's the shortest way to find my WAN IP address at the command line? [duplicate]

What's the shortest command I could use to find out my WAN IP?
1
vote
1answer
40 views

How do I keep running a command in the same area of the console window? (“w”)

I'm looking at the output of w: ehryk@ArchHP ~> sudo w 14:12:37 up 4:08, 4 users, ...
2
votes
1answer
103 views

How to access KVM guest console without password?

How can I configure a KVM guest running CentOS to allow passwordless console access from the hypervisor? I want to be able to use the following command to log straight in to the VM from the hypervisor ...
1
vote
1answer
62 views

Can I check how much energy a USB device is consuming?

Is there any utility I could use to check how much energy a USB device is consuming, for a given time frame?
1
vote
1answer
54 views

Output Redirection

I am using the tee command to output the compilation errors of a program into a file along with the terminal. gcc hello.c | tee file.txt This is the command I have used. The compilation errors are ...
12
votes
2answers
957 views

Ctrl+D for ending terminal line input

If I do $cat > file.txt text<Ctrl+D><Ctrl+D> Question1: If I don't press enter, why do I have to press Ctrl+D twice? If I do $cat > file.txt pa bam pshhh<Ctrl+Z> [2]+ ...
1
vote
1answer
123 views

What does this `xhost …` command do?

Please help me understand this line of command: xhost +SI:localuser:lightdm in reference to the answer in this post and also suggest if there's a better way and why that's needed. I couldn't make ...
3
votes
3answers
125 views

extract from line to line and then save to separate file

I tried my luck with grep and sed but somehow I don't manage to get it right. I have a log file which is about 8 GB in size. I need to analyze a 15 minute time period of suspicious activity. I ...
4
votes
1answer
201 views

How to install / parse build dependencies from debian/control?

Let's suppose you downloaded a source code folder, that contains an existing /debian/ folder as well as /debian/control file. Let's suppose the package in question is not in Debian official ...
1
vote
1answer
65 views

Get file names in awk result

I have many files in a location where I need to list file names in which 32th column has value more than 3000. This is the command that gives me those records: awk -F, '$32 > 3000' * Now can ...
1
vote
1answer
311 views

How can I add applications to the lxpanel application launch bar via cli?

Is there a way on LXDE toolbar to change what applications are on the quick launch part via the terminal so that it can be put in a batch file to change on multiple clients?
1
vote
1answer
31 views

How do I merge (without copying) two directories? [duplicate]

I have: $ find 1 2 -printf '%i %p\n' 40011805 1 40011450 1/t 40011923 1/a 40014006 1/a/e 40011217 1/a/q 40011806 2 40011458 2/y 40011924 2/a 40013989 2/a/e 40013945 2/a/w I want: <inode> ...
-2
votes
2answers
80 views

Can I copy multiple directories into a single directory with a single command?

I have used photorec to recover data from a HDD and now have many directories /home/ray/recup_dir.1, to /home/ray/recup-dir.598 taking up valuable space in my Home directory. I want to copy them ...
1
vote
1answer
71 views

Can't boot Voyager Linux based on Xubuntu

I recently installed Voyager Linux, an linux distribution based on Xubuntu. The problem is that I cant boot it anymore. I have a dual boot system with Windows 8.1, but that's not the problem. I ...
0
votes
0answers
30 views

Pipe to `ls` Not Working as Expected [duplicate]

When I issue: [dave@dhost ~]$ which tar | ls -l I get the output of ls -l of the pwd. I expected to get: -rwxr-xr-x. 1 root root 395472 Feb 21 2013 /bin/tar Why doesn't the pipe work as I ...
1
vote
0answers
88 views

Unable to create a configuration directory for [FishShell] Please set the $XDG_CONFIG_HOME variable

I'm getting this error when starting fishshell: melanie:~ melanie$ fish fish: Unable to create a configuration directory for fish. Your personal settings will not be saved. Please set the ...
3
votes
2answers
136 views

closing parent process(terminal) doesn't close a specific child process

I'm new to Linux and so far,I have come to understand that if we open a new process through a gnome-terminal eg: gedit & "& for running it in background", then if we close the terminal, gedit ...
2
votes
4answers
93 views

How can I lock myself out of a linux box with iptables?

In the Securing Debian Howto I read (about iptables): The tools can easily be misused, causing enormous amounts of grief by completely crippling network access to a system. It is not terribly ...
2
votes
1answer
68 views

Concatenate and pass as parameter, bash

Need some help with removing default gateway. For example, there is an IP 192.168.4.15 with default gateway 192.168.4.14. I connect to WLAN with gw 10.0.0.1 and after that I would like do remove ...
1
vote
3answers
124 views

Running background process with screen command in xshell

screen command is a nice program for us to run process background, but I found Ctrl + a w do not show screen windows list in xshell(Xmanager component) and Ctrl + a k do not kill this screen terminal ...
1
vote
2answers
57 views

How to get a positive signal upon the successful completion of a command

For each of the following commands (four in total) I would like get an exception if one of them throws an exception if case of an error. Ultimately, I will run this through Python using os.system(). ...
2
votes
1answer
136 views

Changing the preferences of Gnome-terminal from within the terminal

Is there any way that we can edit the terminal preferences like background, colors, etc., from within the command line itself? The terminal is Gnome-terminal. I'm using Ubuntu 14.04 trusty tahr. I'm ...