Escape sequences such as encodings of terminal commands and function keys

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1answer
3k views

Proper escaping of double quotations for curl post data?

I'm trying to test out a server, by sending it JSON data and reading the response. I need to POST data like {"item":"value with spaces"} but when I use curl I find that it sends the backslashes as ...
2
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2answers
167 views

Programmatically detect the ANSI escape code supported by terminal

I am playing around with shell scripts that use ANSI codes and found that for one reason or another different escape codes are supported depending on your terminal/OS. In some cases I get a dump of ...
2
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0answers
99 views

Bash - Convert escape character colored text to BBCode

I want to convert a terminal escape-character colored text file to BBCode colored text. For this i've created an Android logfile with logcat -Cd > /sdcard/logcat.txt. The -C switch adds the color ...
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2answers
49 views

Reinterpret terminal output

I have a program that executes some commands in a terminal (for example apt-get update) and stores the output. How can I reinterpret the output, so I can remove all information that is not needed ? ...
10
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3answers
802 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 ...
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3answers
197 views

How to print control characters with escape sequences?

I have defined the color red using tput red=$(tput setaf 1) to colorize warnings in my program. This works fine: printf '%sfail\n' "$red" # prints 'fail' in red But on one occasion I would like ...
0
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1answer
42 views

How to escape an input string in Bash [closed]

I'm using the jq tool to handle some JSON in bash. Just one problem, while using this line: PB_ACL="acl="`echo $IMGREQ | jq -r'.data.acl'` Result: echo $PB_ACL // acl= The expected value jq ...
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1answer
41 views

Background color whitespace when end of the terminal reached

I am working with control sequences for text formatting and have stumbled upon some unexpected behavior. I have some text to output, in the middle of this text there is some smaller text block ...
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1answer
33 views

bash: Passing several space containing filenames

In a bash script I am rasterizing a PDF page by page into single files, in the end the single resulting PNGs are merged again into a PDF like this: convert -monitor /path/to/1.png /path/to/2.png ...
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3answers
14k views

How to escape quotes in shell?

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 ...
1
vote
1answer
35 views

Backquotes interpretation

I'd like to know what's the difference between these two commands: echo ` echo `date` ` echo ` echo \`date\` ` I know that \ is used to escape characters, but I cannot understand it in this ...
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2answers
51 views

/bin/sh - echo >> operator not working as expected

I'm writing a shell script that appends binary contents to a file. I tried using this command: echo -en '\x61\x62\x63..' >> /tmp/myfile but that caused the following output: -en ...
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2answers
95 views

How to escape in YAML the correct way?

On CentOS 7 I am using cloud-init to spin off a droplet using the DigitalOcean API which requires YAML formatting. I got most parts working fine, but struggle on escaping the commands running at ...
2
votes
1answer
31 views

Bell and escape character in prompt string

My prompt string is printed using this statement, printf '\033]0;%s@%s:%s\007' user host /home/user Why does it need an escape character (\033) and a bell character (007)? When i ran the same ...
2
votes
3answers
2k views

What is the problem with the output of plink?

On my Windows7 machine, I'm traversing to the installed path of PuTTy Application and running: plink <hostname> to connect to my remote Linux host. I see some unrecognized characters in the ...
5
votes
1answer
60 views

cssh intercepts F10

I am using cssh (cluster-ssh) to ssh to multiple machines simultaneously. Everything works great, except that cssh intercepts F10 key (which in cssh opens menu. This is very unfortunate, because I ...
2
votes
1answer
55 views

How do I properly escape this long su + sed command?

#!/bin/bash wineuser=tom su $wineuser -c "sed -i '$ialias ptgui "wine ~/.wine/drive_c/Program\ Files/PTGui/PTGui.exe\"' /usr/people/$wineuser/config/cshrc.csh" The acutal line inserted to tom's ...
1
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1answer
30 views

LS_COLORS for 256-color terminal

I thought ls colors are defined as <file_type>=[<bg(40-47)>];<font_spec(0:5)>;<font_color(30-37)> but, I recently found this where there are more colors and colors are ...
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2answers
14k views

Why does Ctrl-D (EOF) exit the shell?

Are you literally "ending a file" by inputting this escape sequence, i.e. is the interactive shell session is seen as a real file stream by the shell, like any other file stream? If so, which file? ...
5
votes
1answer
148 views

How do I store colored text in a variable and print it with color later?

If I do git status --short, git lists files that are not tracked with two red question marks in front: I'm trying to store this in a variable and print it with color later. Here's my bash script: ...
2
votes
2answers
98 views

How to escape correctly this word on vim?

I want to substitute this word ${ARRAY1[@]} with $1 on vim substitution command I did :%s:\$\{ARRAY1[\@]\}:\$1:g But give me error about number of repetition,i try also "" but doesn't work How to ...
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5answers
2k views

Is there any reason why I get ^[[A when I press up arrow at the console login screen?

Whenever I'm at the console login, I press up arrow intentionally to see the previously typed commands. But I see this ^[[A. But when I press Ctrl Alt Print Screen Scroll Lock Pause Break Page Up ...
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1answer
83 views

using ansi escape codes to change the background color in xfce4-terminal

This works to change the background color for the entire terminal with xterm: printf '\033]10;%s\a\033]11;%s\a' Blue Red It doesn't work in xfce4-terminal, tho. Is there something that will work? ...
5
votes
1answer
125 views

Escaping strings in associative arrays (bash)

I am writing a script which executes a number of programs with arguments. To simplify it as much as possible, consider the following example: programs=( "ls" "echo" ) declare -A parameters ...
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2answers
64 views

echo with backspace

I am trying to figure out why this happens in bash. Ok this is easy enough. $ echo -e 'a\txy\bc' a xc Ok this is easy enough. $ echo -e 'a\txy\b\b\b\b\b\b\b\b\bc' ac xy Ok this is easy ...
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1answer
44 views

How use '(' token when using it for searching with ag / awk?

$ ag findVersions( src/java/com/google -bash: syntax error near unexpected token `(' I tried quoting it, escaping it, both were not suitable. $ ag findVersions\( src/java/com/google ERR: ...
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1answer
93 views

Echoing Backspace Characters in the Terminal

I'm working with picocom running inside gnome-terminal. I have local echo switched on inside picocom using the -e option, and when I backspace I can see that caret moves backwards, however the ...
1
vote
1answer
55 views

sed exception handling of escaped characters

I want to delete anything that follows a % to the end of the line. Using cat /tmp/foo.txt | sed 's/%.*$//' works great with one exception: I want to ignore any escaped percent signs \%. So with ...
0
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1answer
157 views

How to remove the ESC characters from Notepad++

How to remove the ESC characters in black background from Notepad++ v6.7.3
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2answers
218 views

When to use bash ANSI C style escape, e.g. $'\n'

I don't use bash often but I recall in the past to pass a tab or newline on the command line I would have to escape the character using the special $ character before a single quoted string. Like ...
2
votes
3answers
74 views

Command substitutions vs backslash escapes in a quoted string

Consider a double-quoted command substitution with backslash escapes inside it, like this: echo "$(echo '\\')" It prints out \\, whereas I would have expected it to print out only one backslash. My ...
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1answer
46 views

How to configure the system in order beeing able to hear the sound of the \a escape character?

I read, that if I execute: echo -e "\a" a sound emerges, but frankly speaking, i executed this command several times and no sound happened.
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2answers
294 views

sh -c: Unterminated quoted string error [duplicate]

I've spent hours trying to understand the following error. My Script CMD="sh -c 'echo \"a\"'" $CMD Error: "a"': 1: "a"': Syntax error: Unterminated quoted string of course when I do echo $CMD ...
26
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6answers
22k 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?
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4answers
68 views

echo \\* - bash backslash escape behavior, is it evaluated backwards?

So in bash, When I do echo \* * This seems right, as * is escaped and taken literally. But I can't understand that, when I do echo \\* \* I thought the first backslash escaped the second one ...
1
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1answer
48 views

Apply Escape Characters in Redirected Output

I'm running a program that prints lots of escape characters (like "Esc[1A", to move the cursor up one line), and trying to redirect the output to a log file. When I run the program without ...
2
votes
3answers
4k views

How to escape a single quote? [duplicate]

This works fine: sed -i 's# @driver.find_element(:xpath, "//a\[contains(@href,##' temp_spec.rb against a source of @driver.find_element(:xpath, "//a[contains(@href,'change_district')]").click ...
4
votes
3answers
1k views

How to escape single quotes correctly creating an alias [duplicate]

I've been given this one-liner to know how much memory my processes consume. $ ps -u $USER -o pid,rss,command | \ awk '{print $0}{sum+=$2} END {print "Total", sum/1024, "MB"}' Now I'd like to ...
5
votes
2answers
7k 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 ...
4
votes
4answers
223 views

Viewing man pages with scroll wheel support

I'd like to use the scroll wheel (xterm mouse escape codes) to scroll through man pages, like I can in emacs with xterm-mouse-mode. less doesn't seem to have support for that and short of recompiling ...
22
votes
6answers
14k 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) ...
1
vote
1answer
1k views

How to remove junk characters from the file generated by script command in linux [duplicate]

I am using script command to record everything from terminal. But when I am opening the generated file its having lots of junk character. Can anyone help me to remove these junk characters from file ...
6
votes
2answers
204 views

How to determine the current color of the console output?

I know that, if a coloured terminal is available, one can colour the output of it using escape characters. But is there a possibility to find out, which colour the output is currently being displayed ...
3
votes
2answers
669 views

Remove escape characters using sed

I have input coming from pipe which contains special escape characters. For illustration, the stream looks like this: printf "foo.bar\033[00m" > file cat file How can I remove the trailing ...
0
votes
2answers
59 views

Substituting \ for \\ in column

I exported a column of thousands of salts from Mysql for hashcat. Every instance of the character \ was replaced with a double character \\ in the exported column. Is there a way to either sed or awk ...
2
votes
0answers
49 views

How to use ESC sequences to make terminal region scrollable

I have a stm32f1 controlled device that uses USART/USB port to implement a user control interface. Using a standard terminal software (putty/minicom) a user has an ability to enter simple command in ...
0
votes
1answer
128 views

Shell string escape for command arguments [duplicate]

I'm trying to create "/tmp/pwet/foo bar" with this: DIR="/tmp/pwet/foo bar" ARGS="-p ${DIR}" mkdir $ARGS For integration reasons, I have to keep the ARGS building in 2 steps: ARG = some_options + ...
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4answers
148 views

What is '“^[b” backward-word' When trying to configure ZSH?

I am on a MAC, and I am trying to figure out shortcuts for my ZSH running on Iterm2. When I type bindkey in the shell, I see (among other mappings), the following: "^[b" backward-word "^[f" ...
0
votes
1answer
107 views

ANSI escapes in Pash prompt are displayed as garbage in Gnome terminal

I would like to use Pash, a PowerShell implementation for mono on my CentOS box. After compilation I started it and got $ mono Source/PashConsole/bin/Debug/Pash.exe ...
4
votes
2answers
110 views

Sorting strings with ANSI escape codes

I am trying to print a sorted list of all zsh options, with set options colored green and unset options colored red. I cannot get sort to work properly with on the colored lines though.The below ...