The escape-characters tag has no wiki summary.
0
votes
1answer
36 views
can someone fix my PS1 for bash
I seem to have too many colour escapes so it only works in some prompts - can someone please correct for me ?
PS1='\[\e[0:35m[\u@\e[0:33m\h\e[m \e[0:35m\w]\e[m \e[0:33m`git branch 2> /dev/null | ...
3
votes
2answers
122 views
Change colors in console/virtual terminal
Is there a way to alter all the available colors in console / virtual terminal?
By console, I mean what you get after pressing CTRL + ALT + F1 and not anything like xterm or urxvt. So, I guess that ...
4
votes
5answers
113 views
How to use ' in alias?
I have one-line that I want to call using alias.
while printf '%s ' "$(df -P / | awk 'NR==2 { print $(NF-1) }')"; do sleep 30; done
I tried to escape ' like \' but it didn't work.
What is the ...
3
votes
2answers
53 views
Can I make grep treat escaped multiline as a single line?
How can I make tools like grep treat multilines escaped with a backslash as a long single line?
Let's say I have some files that looks like this:
testvar=test1 \
test2 \
test3
...
2
votes
2answers
55 views
Calling bash from sh (dash) with commands read from args, and “Unterminated quoted string”/“unexpected EOF”
Just thought I'd document this: I'm trying something very simple - set env variable in bash, and print it out:
$ bash -c "a=1; echo a$a;"
a
$ bash -c "a=1; echo a\$a;"
a1
Now I'd want this same ...
1
vote
2answers
68 views
How to print shell variables and values to be able to copy/paste them?
In Bash 4.2.25, the set and env output is not escaped, so shell escapes and any non-printable characters won't be copy-pasteable. Take for example this shell session:
$ export foo=$'a\nbar=\baz'
$ ...
0
votes
1answer
38 views
Colon breaks the variable subsitution [closed]
I am trying to lookup some C functions so that I could debug while using strace. So I setup a bash function to look it up in firefox (or links), but the substitution falls apart with : and escaping ...
0
votes
2answers
63 views
Can groff create a ps file with interpreted ANSI escape characters?
This question is inspired by this one on SU. How can I print bold or color using lp and ANSI escape sequences? I know how to display, for example, bold text in the terminal:
$ echo -e ...
1
vote
2answers
80 views
How to escape text in awful.util.spawn_with_shell command?
Based on a suggestion, I've now got the following call in rc.lua:
awful.util.spawn_with_shell('vlc $(xclip -o)')
How do I ensure that the output of xclip is escaped so that space characters are not ...
1
vote
1answer
75 views
How to prevent double escaping?
I'm trying to put a bunch of images together into a pdf. I ran gm convert *.jpg out.pdf and it worked, but the images were not in the right order.
I found that ls -v orders them correctly so then I ...
0
votes
1answer
29 views
What characters in my printed boot scroll are artifacts?
I am a tech writer and I need to include a boot dump in a document. The dump the engineers gave me has some "bad characters" that I need to delete. What form does a "bad character" take? There are ...
2
votes
1answer
50 views
How can a bash script detect support for window titling escape characters?
I have a debug trap that runs every time I enter a command in bash that sets the window title to indicate what command is running. I'm leaving out all the configuration details and boil it down to:
...
2
votes
1answer
53 views
Confused about when to escape metacharacters in pathnames
I'm pretty confused about under which circumstances do I need to escape metacharacters in pathnames. Consider the following example:
I'm in the following working directory:
$ echo $PWD
...
1
vote
2answers
186 views
Convert discus output into readable HTML mail
How can I take the DISCUS command output below:
and convert it into something HTML email friendly? I've bash scripted something like this:
#!/bin/sh
discus > /tmp/discus.log
touch ...
4
votes
1answer
64 views
how to escape “\”in ssh-copy-id?
I'm connected to Ubuntu server that is a member of a corporate Active Directory domain via likewise-open. The users are in the form mydomain\myuser. I can connect to it via ssh, escaping the \ with ...
2
votes
1answer
178 views
Trouble in script with spaces in filename
I've got a script that scp's a file from remote host back to local. Sometimes the file names contain spaces. scp does not like spaces in its file names. For some reason my attempts at handling the ...
2
votes
1answer
189 views
Shell escape characters for sh -c
I need to execute a command with escaped argument(s) using sh -c. I know the string looks pretty ugly but simple ones don't cause a problem.
The output of the echo when passed to sh -c is different ...
2
votes
1answer
93 views
Graphical console applications in Emacs
I am having trouble running htop within an ansi-term in Emacs 24.2. It looks like some of the control characters are not interpreted correctly.
I thought ansi-term was capable of handling font ...
1
vote
2answers
242 views
bash scripting - Any function to escape character?
I am trying to automate some of my stuff and facing a issue, the problem boils down to escaping the value that is being passed as a argument to the script.
myScript.sh
#!/bin/bash
loadPatch -name ...
2
votes
1answer
139 views
How to capture text formatting in bash?
The following shell script works but removes colored formatting generated by rspec:
#!/bin/bash
OUTPUT=`rspec`
echo "$OUTPUT"
How to preserve the colors?
3
votes
1answer
131 views
Printing colored text using script
When I type below command in the shell I get the OUTPUT in green color.
Command
echo "\033[32mCONNECTING TO abpwrk\033[m";
Output(in green color)
CONNECTING TO abpwrk
But if I use the same ...
2
votes
1answer
656 views
Backspace, del, arrow keys not working with interactive programs in Tilda
I currently run Openbox on a light netinstall of Debian. In Tilda, when I use a program like nslookup or winexe, some of my keys do not work properly.
Backspace generates ^?
Up generates ^[[A
...
1
vote
0answers
102 views
ESC-q doesn't work in tmux with zsh
The title says it all. I use Escq a lot (stashing the current line while I execute another command), and it works fine with Gnome Terminal 3.6.0 + zsh. However, if I start tmux, then it stops working: ...
0
votes
1answer
201 views
Escape Code to Change Cursor Shape
I know that Konsole supports an escape code like "\<Esc>]50;CursorShape=0\x7" that will change the cursor shape. I was wondering if any other terminal emulators support changing the cursor shape ...
2
votes
2answers
259 views
How to copy a piped list of files contained spaces and apostrophes?
I have a list of files generated using find that I want to feed (pipe) to cp. My problem is that the files have spaces and apostrophes in them, leading cp to repeatedly complain that it "cannot stat". ...
1
vote
1answer
67 views
Apostrophe appearing as space
I am trying to insert the following message:
friend's mobile number
from a file over redhat server into sql server 2005.
this message is appearing in the sql server as below:
friend s mobile ...
6
votes
2answers
600 views
How do I background an SSH session? [duplicate]
Possible Duplicate:
How can I break away from an SSH session that has crashed?
I have started an SSH session on the command line, but now I want to get back to my local command line. For ...
5
votes
1answer
1k views
export HTTP_PROXY and special characters in passwd
Suppose for the sake of argument my password below is abc123@
I need to authenticate my linux machine through a corporate proxy to get patches and updates... normally I'd use this:
export ...
3
votes
2answers
719 views
Passing a bash command-line argument containing a dot
How can a command-line argument containing a dot (.) be passed? Are there any escape sequences for capturing characters like dot?
The following invocation of a bash-script from the shell does not ...
3
votes
3answers
2k views
How can I pass strings with single quotes to grep?
My desired outcome is the following: to recursively search a directory looking for a given string in all found files. The following command is my usual port of call:
find ./ | xargs grep -ns 'foobar'
...
5
votes
4answers
1k views
How can I create a file with multiple lines from the command-line?
How can I enter the following contents in a file:
Hi
abcd
I tried using echo "Hi\nabcd" >> ab.txt, but in the file it's written as is (the \n is included, instead of a newline)
2
votes
1answer
167 views
Is there a way to lock terminal's title?
Sometimes there're lots of different sessions opened in own terminal's tabs and it's rather desirable to have theirs initial titles (named by session name) locked since local title tweaks make those ...
3
votes
1answer
291 views
Escape sequences in output of script called from ncurses application
I'm currently running mcabber as my Jabber client (which uses ncurses) in a tmux session on my homeserver. Locally i run iTerm2 as a terminal emulator, which supports the triggering of growl ...
1
vote
1answer
454 views
Opening a file with space from Ruby
When I need to progmatically open in emacs a file that has a space in its name, how can I do that? I've tried these commands from a Ruby script, inside backquotes or popen(…):
emacs "foo bar"
or
...
3
votes
1answer
517 views
How to bypass GNOME Terminal when sending keyboard input?
When running an interactive shell application, how can I send it a key (or key combination) which would normally be intercepted by GNOME Terminal? In this particular instance it's the F10 key which is ...
2
votes
1answer
473 views
Escaping of meta characters in basic/extended posix regex strings in grep
Is it possible to escape all meta characters of a string inside a variable before passing it to grep? I know similar question has been asked before on SE
(here) and also a good explanation here, but I ...
7
votes
4answers
2k views
How to make the terminal display user@machine in bold letters?
I have seen in some screen-shots (can't remember where on the web) that the terminal can display the [username@machine /]$ in bold letters. I'm looking forward to getting this too because I always ...
4
votes
2answers
291 views
is it possible to send a control sequence to a terminal emulator using the keyboard
If you type echo -e '\eZ' and hit return in a shell running in an xterm, you'll see that the terminal emulator prints an obscure code 1;2c. This seems to indicate that xterm interprets the VT100 ...
7
votes
2answers
1k views
inline double and single quote escaping
I'm having trouble with escaping characters in bash. I'd like to escape single and double quotes while running a command under a different user. For the purposes of this question let's say I want to ...
2
votes
1answer
540 views
In Bash, why is PROMPT_COMMAND set to something invisible?
On RHEL6 and CentOS 6, /etc/bashrc sets PROMPT_COMMAND here:
case $TERM in
xterm*)
if [ -e /etc/sysconfig/bash-prompt-xterm ]; then
PROMPT_COMMAND=/etc/sysconfig/bash-prompt-xterm
...
2
votes
2answers
322 views
Is the `\` character escaping or becoming part of my ssh key password
If I do:
ssh-keygen -N password123\$ -f bobskeys
Is \ escaping the $ character or becoming part of the password?
Or rather, will bash be doing any escaping before ssh-keygen gets the password ...
6
votes
4answers
1k views
How to clear terminal completely?
When we use clear command or Ctrl+L in terminal, it clears terminal but we can still scroll back to view the last used commands. Is there a way to completely clear the terminal?
4
votes
1answer
491 views
How can I match the page break character in a regular expression?
Nano calls it ^L, but of course, typing something like
$ grep -v "^\^L" file
doesn't work. Its unicode codepoint is 000C. How can I match it in a regular expression?
4
votes
2answers
263 views
DEC ANSI command sequence questions; cursor movement
So I'm writing a terminal emulation (I know, I should just compile putty, etc.) and am at the stage of plodding through vttest to make sure it's right. I'm basing it on the VT102 for now but will add ...
3
votes
2answers
690 views
Trying to print up down arrow keys
I have this:
I read down arrow key
abc@abc-ubuntu:~/bashpratice$ read -n 3 key
^[[Babc@abc-ubuntu:~/bashpratice$
I am able to grep for it
abc@abc-ubuntu:~/bashpratice$ echo $key | grep '\['
[B
...
2
votes
1answer
127 views
Modifying a set of binary files
I have several binary files with the character 0x04 in them, and I'd like to add an escape \ character before each. Is there a script I can use to do this without needing to manually edit each one?
2
votes
2answers
465 views
How to escape < or > in a parameter in shell?
I'd like to use grep with a PCRE expression that contains the < character. Bash thinks I want to redirect, but I don't want to. How can I escape <?
3
votes
1answer
249 views
Could someone please explain some of these escape codes?
I'm seeing this in my .bashrc file:
PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\
[\033[01;34m\]\w\[\033[00m\]\$ '
and I have absolutely no idea what all those ...
6
votes
2answers
701 views
How to avoid escape sequence attacks in terminals?
Reading the details of CVE-2009-4487 (which is about the danger of escape sequences in log files) I am a bit surprised.
To quote CVE-2009-4487:
nginx 0.7.64 writes data to a log file without ...
11
votes
3answers
3k views
Removing control chars (including console codes / colours) from script output
I can use the "script" command to record an interactive session at the command line. However, this includes all control characters and colour codes. I can remove control characters (like backspace) ...
