Styjun

Can you pop microwave popcorn on a stove?

Golfball Dimples on spaceships (and planes)?

I multiply the source, you (probably) multiply the output!

Template default argument loses its reference type

Are fast interviews red flags?

How do I play this harmonic? (Guitar)

Python reimplementation of Lost In Space by Tim Hartnell

How to best explain that you are taking pictures in a space for practice reasons?

How to apply a register to a command

Project Euler problem #112

How do English-speaking kids loudly request something?

O.5=north.5 (are this the same?)

Compiler optimization of bitwise not operation

If every star in the universe except the Sun were destroyed, would we die?

Laptop failure due to constant fluctuation of AC frequency and voltage

How can I hint that my character isn't real?

After a few interviews, What should I do after told to wait?

How many attacks exactly do I get combining Dual Wielder feat with Two-Weapon Fighting style?

Did the Byzantines ever attempt to move their capital to Rome?

Why has Marx's "Das Kapital" been translated to "Capital" in English and not "The Capital"

Friend is very nit picky about side comments I don't intend to be taken too seriously

How do draw effects during the discard phase work?

What does "先が気になる" mean?

How to make a pipe-divided tuple?

PS1: How do I echo colorcodes from functions that get executed in subshells?

Get the source directory of a Bash script from within the script itselfHow to check if a program exists from a Bash script?How to change the output color of echo in LinuxIs there a way to write a bash function which aborts the whole execution, no matter how it is called?PS1 correct line wrapping in BashGetting a dynamic bash prompt PS1 rightBash PS1: line wrap issue with non-printing characters from an external commandRewriting commands from history causes pieces of command and PS1 to be deleted and cursor to move unexpectedlyHow can I conditionally include a newline in a bash prompt *without a filler char*How do I color bash PS1 prompt from the result of a function

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

0

I've never really touched bash before so it might be that the solution to my problem is obvious, but I can't wrap my head around it. I want to set my PS1 to certain values with certain colors. It works fine until I echo a color code from a subshell, then it gets messed up.

For example:

some_color='33[01;38;5;196m'
PS1="[$some_color] $USER "

Works just fine. Assume I have a function called get_color that echoes the color code with the escape sequence, my prompt prints the sequence [] in front of the username and the bash history is messed up when I hit arrow up a couple times.

some_color='33[01;38;5;196m'
function get_color() 
 echo -n "[$some_color]" 

PS1="$(get_color) $USER "

When I ommit the sequence it prints the right output but the bash history is still messed up.
When I use printf and the sequences 01 and 02 instead of [ and ] it works just fine. Why does it not work with echo?

some_color='33[01;38;5;196m'
function get_color() 
 printf 01$some_color02" 

PS1="$(get_color) $USER "

bash prompt ps1

share|improve this question

edited Mar 28 at 14:32

melodyscat

asked Mar 28 at 5:56

melodyscatmelodyscat

111 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why do you not want to use printf Instead of echo? It is decidedly the better option.
  
  – tripleee
  Mar 28 at 7:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  [ and ] are special syntax unique to PS1, to tell it to start or stop counting characters as printable for purposes of determining curser location / line wrap / etc; they have no meaning in any other context. There's no need to substitute something else in place of them -- you can just leave them out entirely.
  
  – Charles Duffy
  Mar 28 at 14:56
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ...and re: the printf-vs-echo thing, see the POSIX specification for echo advising that printf be used instead in the APPLICATION USAGE section at pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html
  
  – Charles Duffy
  Mar 28 at 14:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Leaving them out in the function leads to weird behaviour, I assume the shell isn't calculating the prompt length properly. Replacing them with 01 and 02 and printf works though.
  
  – melodyscat
  Mar 28 at 18:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I ended up using printf now but I'm still curious to why those sequences don't work with echo. Are they printf specific?
  
  – melodyscat
  Mar 28 at 18:54
  

  
  
  
  

 | 
show 1 more comment

0

I've never really touched bash before so it might be that the solution to my problem is obvious, but I can't wrap my head around it. I want to set my PS1 to certain values with certain colors. It works fine until I echo a color code from a subshell, then it gets messed up.

For example:

some_color='33[01;38;5;196m'
PS1="[$some_color] $USER "

Works just fine. Assume I have a function called get_color that echoes the color code with the escape sequence, my prompt prints the sequence [] in front of the username and the bash history is messed up when I hit arrow up a couple times.

some_color='33[01;38;5;196m'
function get_color() 
 echo -n "[$some_color]" 

PS1="$(get_color) $USER "

When I ommit the sequence it prints the right output but the bash history is still messed up.
When I use printf and the sequences 01 and 02 instead of [ and ] it works just fine. Why does it not work with echo?

some_color='33[01;38;5;196m'
function get_color() 
 printf 01$some_color02" 

PS1="$(get_color) $USER "

bash prompt ps1

share|improve this question

edited Mar 28 at 14:32

melodyscat

asked Mar 28 at 5:56

melodyscatmelodyscat

111 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why do you not want to use printf Instead of echo? It is decidedly the better option.
  
  – tripleee
  Mar 28 at 7:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  [ and ] are special syntax unique to PS1, to tell it to start or stop counting characters as printable for purposes of determining curser location / line wrap / etc; they have no meaning in any other context. There's no need to substitute something else in place of them -- you can just leave them out entirely.
  
  – Charles Duffy
  Mar 28 at 14:56
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ...and re: the printf-vs-echo thing, see the POSIX specification for echo advising that printf be used instead in the APPLICATION USAGE section at pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html
  
  – Charles Duffy
  Mar 28 at 14:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Leaving them out in the function leads to weird behaviour, I assume the shell isn't calculating the prompt length properly. Replacing them with 01 and 02 and printf works though.
  
  – melodyscat
  Mar 28 at 18:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I ended up using printf now but I'm still curious to why those sequences don't work with echo. Are they printf specific?
  
  – melodyscat
  Mar 28 at 18:54
  

  
  
  
  

 | 
show 1 more comment

I've never really touched bash before so it might be that the solution to my problem is obvious, but I can't wrap my head around it. I want to set my PS1 to certain values with certain colors. It works fine until I echo a color code from a subshell, then it gets messed up.

For example:

some_color='33[01;38;5;196m'
PS1="[$some_color] $USER "

Works just fine. Assume I have a function called get_color that echoes the color code with the escape sequence, my prompt prints the sequence [] in front of the username and the bash history is messed up when I hit arrow up a couple times.

some_color='33[01;38;5;196m'
function get_color() 
 echo -n "[$some_color]" 

PS1="$(get_color) $USER "

When I ommit the sequence it prints the right output but the bash history is still messed up.
When I use printf and the sequences 01 and 02 instead of [ and ] it works just fine. Why does it not work with echo?

some_color='33[01;38;5;196m'
function get_color() 
 printf 01$some_color02" 

PS1="$(get_color) $USER "

bash prompt ps1

share|improve this question

edited Mar 28 at 14:32

melodyscat

asked Mar 28 at 5:56

melodyscatmelodyscat

111 bronze badge

some_color='33[01;38;5;196m'
PS1="[$some_color] $USER "

some_color='33[01;38;5;196m'
function get_color() 
 echo -n "[$some_color]" 

PS1="$(get_color) $USER "

some_color='33[01;38;5;196m'
function get_color() 
 printf 01$some_color02" 

PS1="$(get_color) $USER "

share|improve this question

edited Mar 28 at 14:32

melodyscat

asked Mar 28 at 5:56

melodyscatmelodyscat

111 bronze badge

share|improve this question

edited Mar 28 at 14:32

melodyscat

asked Mar 28 at 5:56

melodyscatmelodyscat

111 bronze badge

asked Mar 28 at 5:56

melodyscatmelodyscat

111 bronze badge

asked Mar 28 at 5:56

melodyscatmelodyscat

111 bronze badge