Tagged Questions
0
votes
1answer
29 views
Opera, Firefox has no kiosk option like Chrome gives it openly?
While using Chrome kiosk mode, i have problem with openbox desktop, its not doing correct for some javascript rendering. So i wanted to test opera and firefox but both does not support kiosk at all ...
5
votes
2answers
65 views
Combining multiple process substitution
Suppose you tried something like this:
$ paste ../data/file-{A,B,C}.dat
and realize that you want to sort each file (numerically, let's suppose) before pasting. Then, using process substitution, ...
2
votes
6answers
131 views
sort ls output by users
On Linux, is there a way to sort ls output by users? What I try to achieve is something like this:
user_a file1
user_a file2
user_b another_file
user_c this_file
user_c ...
1
vote
2answers
88 views
How to avoid the need to issue “y” several times when removing protected file
I'm looking for a solution to be used as
a response to "rm: remove write-protected regular file [x] ?"
I was thinking of issuing a character followed by carriage return for several amount of times, ...
3
votes
3answers
93 views
Count number of lines of output from previous program
I'm trying to count the number of lines of output a certain program produces. The problem is, the program takes a long time to run, and I want to display the output to the user. Is there a way to ...
1
vote
0answers
21 views
rsstail Not Printing Output
I've installed rsstail 1.8 on my linux box and everything seems to be going smoothly, knock on wood, except for the part where rsstail isn't printing the streams. Running the command, I see that it's ...
4
votes
3answers
76 views
Why should 'Character Classes' be preferred over 'Character Ranges' In Shell (Bash)?
The Linux Command Line (Book - page count 47) says:
... you have to be very careful with them [character ranges] because they will not produce the expected results unless properly configured. For ...
1
vote
1answer
64 views
Safely convert unicode strings to printable characters
I have many HTML files containing mixed unicode strings like \303\243 and printable characters like %s. What I'd like to do is converting the unicode strings into printable characters in a safe way.
...
0
votes
3answers
127 views
Regular Expression for finding double characters in Bash
I am looking for a regular expression that finds all occurences of double characters in a text, a listing, etc. on the command line (Bash).
Main Question: Is there a simple way to look for sequences ...
1
vote
1answer
73 views
Command to list contents if directory, or do output contents if file?
Is there any command to list the contents if passed a directory, but output the contents if it's a file?
For example, often when I am navigating the directory structure I will start typing into the ...
2
votes
1answer
57 views
Chain commands with Control + C interrupt
I am trying to execute a program which loops indefinitely, and so must be forcibly interrupted. After executing the program, I want to delete it. I can do it in several steps:
./MyProg
Control + C
...
1
vote
2answers
58 views
Configure bash to execute command with last argument when no argument was provided
I would like to configure bash so that when I execute command (preferably from a list of commands, not any command) without an argument, it takes the argument of previous command.
So, for example I ...
1
vote
2answers
258 views
How to display open file descriptors but not using lsof command
Hi I have read Here that lsof is not an accurate way of getting the number of File Descriptors that are currently open. He recommended to use this command instead
cat /proc/sys/fs/file-nr
While ...
17
votes
5answers
691 views
Difference between “. myscript” and “./myscript” [duplicate]
I am confused by "one only dot - space - shell script name" (like . myshellscript) and "path to shell script" (like ./myshellscript) commands.
What for they are? I noticed the command . myshellscript ...
1
vote
0answers
137 views
Processing shell script options with awk
I'm looking for way to process shell script arguments that is cleaner and more "self documenting" than getopt/getopts.
It would need to provide...
Full support of long options with or without a ...
1
vote
1answer
97 views
Why is my mmv command not overwriting the files?
I have a batch file that, among other things, uses the command mmv to rename some files. The relevant line is like this:
mmv "$BASEDIR/files/*.txt" "$BASEDIR/files/#1.strings"
In essence it works, ...
2
votes
3answers
131 views
Howto recursively create PDF thumnbails on linux command line
I am able to use ImageMagick to create a thumbnail of the first page of a PDF using:
convert -thumbnail x80 95.pdf[0] thumb_95.png
This works fine and generates a thumb_95.png file.
I have tried ...
1
vote
2answers
137 views
How to use tail -f with grep to show surrounding lines
I would like to see the output in a logfile greped by only one domain but also the following two lines.
Example:
tail -f /var/log/apache2/modsec_audit.log |grep mydomain.de
this shows all lines, ...
4
votes
4answers
258 views
Compute average file size
I am looking for a handy one-liner for computing the average file size in a directory.
What I want is:
size of all files / number of files in directory
3
votes
1answer
161 views
Pausing rsync via bash script?
Is there a way to pause rsync via command line, if it transfers data for over X minutes? I'm working on using it as a backup and would like it to pause every once in a while to prevent the hard disks ...
3
votes
2answers
91 views
Make copies of a single directory to multiple directories with different names
I'm trying to replicate a single directory (with sub-directories) to a bunch of new directories based on a list. For example I can:
mkdir Fred Barney Thelma Louise Foo Bar
How would I copy a premade ...
6
votes
3answers
292 views
Bash: Capture / Use last (or Nth) line in stdout
Query
I use Bash. When I'm looking for files, often I'll do the following:
find -name stackexchange.hs
And often the results will look like:
/youre/the/man/now/dog/stackexchange.hs
...
2
votes
1answer
166 views
Is there a way of color-highlighting paired brackets in shell (bash)?
Does anyone know if there is a way reproducing the same behaviour many text editors provide for colour-highlighting the syntax operators such as brackets or curly brackets. It would be very useful for ...
2
votes
2answers
104 views
Sort the output of find before piping to openssh
I'm using this command to recursively generate a SHA-512 hash for each file in a directory hierarchy:
find . -type f -exec openssl sha512 {} \;
I'd like to sort the files in lexicographical order ...
1
vote
1answer
112 views
What's the essential difference between grep foo $(CMD) and CMD | grep foo
It's really important because intuitively they are all similar for me.
Could one realise that those two are really like one another for me, i.e. absolutely equal?
2
votes
2answers
94 views
Zipping files two by two
I have a directory that has 800 files like this:
file1.png
file1@2x.png
file2.png
file2@2x.png
file3.png
file3@2x.png
... etc
I need to create zip files like this
file1.zip (containing ...
5
votes
2answers
130 views
Why arguments in braces do not expand in this case?
For example, I want to put some file names inside braces for expansion like this:
$ ls
blue_texture blue_waves green_light
$ ls -m | tr -d ' \n'
blue_texture,blue_waves,green_light
$ echo ...
3
votes
3answers
291 views
Copy multiple files to one dir with parallel
I'm using the following script to copy multiple files into one folder:
{ echo $BASE1; echo $BASE2; echo $BASE3; } | parallel cp -a {} $DEST
Is there any way to use only one echo $BASE with brace ...
5
votes
2answers
521 views
What does “--” mean in Linux/Unix command line? [duplicate]
Possible Duplicate:
What does “--” (double-dash) mean?
git diff [options] [<commit>] [--] [<path>…]
In here, how should I understand what [--] means? And when should I use it.
1
vote
2answers
500 views
How to fix Linux filename tab autocomplete that is appending a space instead of trailing slash on directories?
For some strange reason my filename autocomplete is behaving differently than normal. Given the following file structure ./foobar/file.txt, if I want to delete file.txt, I type rm ...
2
votes
1answer
145 views
Display the command being executing currently
I don't recall to have explicitly placed anything in my .bashrc file recently, but from yesterday I am able to see the command being displayed at the prompt before getting executed. I don't know how ...
1
vote
2answers
306 views
ps aux |grep 'asdf' grep: asdf: No such file or directory
For some reason a while back, the behavior of my command line changed, and I don't know why. Using OSX, now Mountain Lion(although this behavior was present before the switch).
Using standard ...
0
votes
2answers
110 views
sqlite fts quoting problem
I can do this in sqlite tool:
sqlite> select caption from notes_fts where notes_fts MATCH '"perl install"';
but cannot from the Linux shell i.e., this fails:
user@host:~$ sqlite3 sqldb ...
1
vote
1answer
145 views
How to make FreeBSD variant of cal start weeks on mondays?
Can week start day be changed in cal output?
Is it hardcoded? Notice: not the ncal.
10
votes
2answers
387 views
Highlight the three last updated files in ls output
Is there any way to overload or wrap the ls command so that it will highlight / underline / otherwise make obvious the last three modified files?
I know that I can simply ls -rtl to order by reverse ...
5
votes
1answer
1k views
How to remove a single line from history?
I'm working in Mac OSX, so I guess I'm using bash...?
Sometimes I enter something that I don't want to be remembered in the history. How do I remove it?
1
vote
3answers
564 views
Reading from STDIN and using data immediatly (while still reading) or opening a URL with zbar
I need to read lines from STDIN and process them. I could do something like:
<print lines to STDOUT> | while read line; do
<process $line>
done
But this means that first all lines ...
6
votes
1answer
758 views
How can I remove duplicates in my .bash_history, preserving order?
I really enjoying using control+r to recursively search my command history. I've found a few good options I like to use with it:
# ignore duplicate commands, ignore commands starting with a space
...
44
votes
10answers
4k views
How to grep a specific line _and_ the first line of a file?
Assuming a simple grep such as:
$ psa aux | grep someApp
1000 11634 51.2 0.1 32824 9112 pts/1 SN+ 13:24 7:49 someApp
This provides much information, but as the first line of the ps ...
2
votes
1answer
100 views
How to put “glue” CWD (etc.) to part of the screen instead of putting into PS1?
I suspect there’s some terminology for this question that I’m not aware of. It’s hard to check if a question has already been answered if one doesn’t know the proper vocabulary. So, sorry if this is ...
2
votes
5answers
491 views
Need to grep file with specific letter and move to another folder linux
I need to select files which contain "Error" or "traffic" in their names, e.g.
abc_ERRor.csv
raError.csv
bsn_Error.csv
bbbctraffic.csv
ccc_traffic.csv
...
and move them into corresponding ...
3
votes
3answers
222 views
Fastest way to open all files in a directory with multiple file extensions on commandline
If I want to open all mp4 files in a directory, I can simply do something like totem *.mp4. But how can I open all mp4 and all flv files in that directory with one command. I.e. I want to do something ...
5
votes
5answers
421 views
Read and confirm shell script before piping from curl to sh (curl -s [url] | sh)
Whenever I have to execute a shell script from the web curl -s [url] | sh, I first open url in my web browser to make sure the script isn't malicious and is safe to run.
I remember seeing a command ...
2
votes
2answers
149 views
List all users and last time they read mail, pipeing to multiple output
I have one system that I would like to do a little clean up, so I would like to get all user accounts and last date they accessed they mail. It is a Debian system.
So far I got to this:
cut -d: -f1 ...
1
vote
4answers
121 views
How can I do the `history` command and not have line numbers so I can copy multiple line commands?
Sometimes I do the history command so I can see 4 commands in a row.
I want to copy those commands so I can run them again.
I usually select them with the mouse and shift-ctrl-c which works ok, but ...
2
votes
1answer
268 views
Git auto-complete
I am using Git as many of you do. Also, I don't use any GUI for that — just CLI. So I was wondering: are there any way to make Git commands (git status, git checkout etc.) complete themselves when ...
0
votes
1answer
57 views
Why does this compound command report errors when copying directories? [duplicate]
Possible Duplicate:
Why does this compound command report errors when copying directories?
if one executes the following two commands in one line, as follows,
rm -rf dir ; cp -r dir2 ...
6
votes
2answers
235 views
How to exit bash history search mode?
In Ubuntu 12.04 I use CTRL-r to enter a reverse history search. If the command I want is not found (after repeated CTRL-r), how do I immediately exit back to the (empty) command prompt with no ...
-2
votes
1answer
539 views
Check if the command exists in bash
I want to check if a given command exists in bash and I care only about the native commands of the bash and not the scripts written by the user. When I refer to native commands I mean all those ...
-1
votes
3answers
199 views
Duplicate bash prompts
I'm having an interesting issue with XFCE Terminal/Gnome Terminal (not reproducible in XTerm), where executing bash or logging in using login or su will open a new Bash instance inside a Bash instance ...
