Escape sequences such as encodings of terminal commands and function keys

learn more… | top users | synonyms

1
vote
1answer
32 views

Double quotes issue in bash script

I have a shell script I am trying to get working. I need the output to be a certain way and I know I'm just not escaping the characters correctly. script: #!/bin/bash set -x DATE=$(date ...
4
votes
4answers
307 views

is there a pastebin service that supports terminal escape sequences?

Is there a pastebin service that supports colors? I understand some of them have syntax hilighting, but I'd like to do arbitrary coloring, preferably using the terminal escape sequences. Example, i'd ...
1
vote
1answer
37 views

Is it possible to do a here-document in one line or echo verbatim?

I often find myself testing out a command (e.g. cat file | awk 'stuff') in the shell and when I'm satisfied with the way it works, I append the command to a script file. Let's say this is the command ...
1
vote
1answer
4k 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 ...
1
vote
1answer
27 views

Maximizing tmux session shows weird ANSI Sequences

I have a tmux session inside Putty. It was fine for past many months, but now I see a strange thing. When I maximize a normal Putty window, and if cursor is not on a new line, then I get some weird ...
2
votes
2answers
47 views

sed to match pattern between matching curly braces

From a pattern such as [string 1]{string 2} I want to extract string 2, the string between the last pair of matching curly braces -- that is delete [string 1] and the open { and close }. My ...
11
votes
3answers
967 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 ...
3
votes
2answers
38 views

How to interpret ' character in a string passed through SSH

New to BASH and Linux and need some quick help. I have written a quick bash script that asks the user for a username and password from the command line and passes that info to a remote server later ...
2
votes
2answers
45 views

Issue with column command and color escape codes

I'm colorizing the header of a table formatted with column -ts $'\t' Works well without color codes, but when I add color codes to the first line column doesn't properly align the output. Without ...
0
votes
2answers
63 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 ...
3
votes
2answers
132 views

Shell-independent escaping for strings in scripts

I just struggled (again) over this: # only in bash NORM=$'\033[0m' NORM=$'\e[0m' # only in dash NORM='\033[0m' # only in bash and busybox NORM=$(echo -en '\033[0m') The goal is to include special ...
19
votes
3answers
679 views

How to prevent random console output from breaking the terminal?

There are many questions on SE that show how to recover from terminal broken by cat /dev/urandom. For those that are unfamiliar with this issue - here what it is about: You execute cat /dev/urandom ...
1
vote
2answers
78 views

Escape characters from echo -e

I have the following in my .bashrc file I use for a log: function log(){ RED="\e[0;31m" RESET="\e[0m" echo -e "${RED}$(date)" "${RESET}$*" >> "$HOME"/mylog.txt } But when I do ...
8
votes
6answers
7k views

How can I create a file with multiple lines from the command-line? [duplicate]

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)
1
vote
2answers
1k views

bash - 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 ...
15
votes
4answers
24k 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 ...
0
votes
0answers
19 views

Escape special chars in csh alias

I want to create an alias for the following thing: diff -r <dir1> <dir2>| grep diff | grep -v "Files " | grep -v "\.git" \ | awk '{print "tkdiff " $3 " " $4}' I am getting lost with ...
2
votes
2answers
41 views

How to escape metacharacters for egrep like metaquote from Perl?

Perl has a function called metaquote() to escape all special characters for a regular expression. Is there an equivalent technique for egrep? Example: If I am searching for the string abc.def.ghi, I ...
2
votes
4answers
143 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 ...
2
votes
2answers
70 views

Why does “shift-tab” result in “Escape” in the terminal?

I just noticed this by accident. I use the vi readline mode (run set -o vi in bash) so it is particularly noticeable; in emacs readline mode I don't think Esc does anything, but in vi mode it exits ...
27
votes
6answers
18k 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) ...
3
votes
4answers
332 views

Executing a 'perl command' from shell and executing the same command from perl script using system command

I am not able to take care of special characters. I have the following perl script. while(@mapping_array[$i]) { chomp(@mapping_array[$i]); my @core= split ( / / , $mapping_array[$i]) ; ...
5
votes
2answers
148 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 ...
1
vote
2answers
72 views

change colour of `echo` for particular line in shell script in Linux?

I want to change the colour of echo for a particular statement in a Linux shell script example : echo "invalid entries" echo "valid entries" echo "valid entry" I want the red color for echo ...
4
votes
4answers
617 views

Null and escape characters

I know that a filename in Linux has no restriction whatsoever except for two characters '/' and '\0'. I know that '/' is prohibited because it is a directory separator but is there any other reason ? ...
2
votes
3answers
83 views

How to substite a " in awk?

For example, I need to change a " into the word quote in to change a string with a " at some point into a string with a quote at some point I have tried: $ echo 'a string with a " at some ...
0
votes
1answer
38 views

expansion with escape character help

I am having trouble doing expansion with this because of the escape character. UNF\1122 Right now I am trying to stick with the really simple example of: ps -ef | grep $USER Eventually after I ...
4
votes
3answers
395 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 ...
1
vote
1answer
66 views

Why is vi (but not cat) showing ^[[31m[^[[m^[[31m" after I use sed and output to a file I then edit? [closed]

When I use cat Variables/user-extensions.js | sed -e 's/css/XXX/' on an input file of the form storedVars["css_body"] = "css=body"; storedVars["css_main"] = "css=main"; I see output such as ...
1
vote
2answers
77 views

Find OS X terminal key combination/escape sequence for Ctrl-'

One of my Emacs keybindings is C-', which works well in GUI. In terminal however, it is not being recognised. I understand that I need to figure out the actual characters sent to the terminal by C-' ...
0
votes
0answers
82 views

Calling a password checking command from PHP using exec() - how to escape user input?

I am working on a PHP-based website where the login form needs to authenticate against local users on the system via PAM - in other words, they should be able to login successfully if they enter a ...
0
votes
1answer
61 views

In vi, convert invisible characters into escape sequences?

My text in vim looks like, i am one line i come in next line i come after a tab space Can the above text be converted like this, i am one line\ni come in next line\n\ti come after a tab space ...
4
votes
1answer
358 views

Match pattern \\\" using grep

I have a json string inside json. This got encoded multiple times and I ended up with many escape backlashes: \\\". The much shortened string looks like, '[{"testId" : "12345", "message": "\\\"the ...
2
votes
1answer
89 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
2answers
42 views

Putting a single quote in a filename [duplicate]

We can a make a directory named $"dollars"&<>\dogs if we surround it with single quotes like the following mkdir '$"dollars"&<>\dogs' However, what if I want to include a ...
9
votes
1answer
681 views

Caret square bracket square bracket A ^[[A - What does it mean?

Apologies if this has already been asked, but I have no idea how I can find this out myself - when I search for "^[[A" in any search engine it ignores the "^[[" part altogether. Anyway, my question: ...
1
vote
2answers
173 views

How tp Print/echo arrow key in unix - bash, version 3.2.52

How do I print ↑ and ↓ in Unix? Basically I have a script written in bash and I am printing some numbers with whom I want to print arrow keys to show increase/decrease. So how do I literally print ...
2
votes
2answers
314 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
votes
0answers
197 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 ...
1
vote
2answers
64 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 ? ...
0
votes
1answer
186 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 ...
1
vote
1answer
125 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 ...
1
vote
1answer
40 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 ...
1
vote
2answers
319 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 ...
1
vote
2answers
400 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
117 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 ...
4
votes
3answers
3k 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
66 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
110 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
vote
1answer
142 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 ...