How to get the cursor position in bash?

问题:

In a bash script, I want to get the cursor column in a variable. It looks like using the ANSI escape code {ESC}[6n is the only way to get it, for example the following way:

# Query the cursor position echo -en '\033[6n'  # Read it to a variable read -d R CURCOL  # Extract the column from the variable CURCOL="${CURCOL##*;}"  # We have the column in the variable echo $CURCOL 

Unfortunately, this prints characters to the standard output and I want to do it silently. Besides, this is not very portable...

Is there a pure-bash way to achieve this ?

回答1:

You have to resort to dirty tricks:

#!/bin/bash # based on a script from http://invisible-island.net/xterm/xterm.faq.html exec < /dev/tty oldstty=$(stty -g) stty raw -echo min 0 # on my system, the following line can be replaced by the line below it echo -en "\033[6n" > /dev/tty # tput u7 > /dev/tty    # when TERM=xterm (and relatives) IFS=';' read -r -d R -a pos stty $oldstty # change from one-based to zero based so they work with: tput cup $row $col row=$((${pos[0]:2} - 1))    # strip off the esc-[ col=$((${pos[1]} - 1)) 

回答2:

I know it may be solved by know, but you could just tell read to work silently with "-s" :

echo -en "\E[6n" read -sdR CURPOS CURPOS=${CURPOS#*[} 

And then CURPOS is equal to something like "21;3".

回答3:

In the interests of portability I've had a go at making a vanilla POSIX-compatible version that will run in shells like dash:

#!/bin/sh  exec < /dev/tty oldstty=$(stty -g) stty raw -echo min 0 tput u7 > /dev/tty sleep 1 IFS=';' read -r row col stty $oldstty  row=$(expr $(expr substr $row 3 99) - 1)        # Strip leading escape off col=$(expr ${col%R} - 1)                        # Strip trailing 'R' off  echo $col,$row 

...but I can't seem to find a viable alternative for bash's 'read -d'. Without the sleep, the script misses the return output entirely...

回答4:

The tput commands are what you need to use. simple, fast, no output to the screen.

#!/bin/bash col=`tput col`; line=`tput line`; 

文章来源: How to get the cursor position in bash?