How to get the number of rows available (unused) in a terminal?

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I can get the total number of rows and columns with stty or tput, but how can I get either the number of rows available (not used) or the index/number of the current row/line in bash or any other shell?

Example:

$ ls
foo bar baz
$ (cursor is here)
.
.

This terminal has 5 rows. The "current row" is 3 and the number of available rows/blank lines after the cursor is 2.

edited Nov 11 '17 at 20:10

asked Nov 11 '17 at 18:48

snahor

1022

2

What exactly do you mean by available (not used)? Do you mean blank lines below the cursor? It would also be useful to show what you've already researched so far.
â€“Â Anthony Geoghegan
Nov 11 '17 at 18:57

As per this part of your question: "* ... the number of rows available... of the current row ...*": what is your definition of "current"? I.e. isn't that like "the row being processed"? If so, then that is always 1. Must be me who doesn't get it ...
â€“Â Pierre.Vriens
Nov 11 '17 at 18:59

Anthony Geoghegan: yes, that's what I need. Pierre.Vriens: I've added an example.
â€“Â snahor
Nov 11 '17 at 20:16

2

Depends on the terminal, obviously. Nowaday, most people say "terminal" when they mean a "terminal emulator", and most terminal emulators are more or less compatible with Xterm. Read the escape sequences understood by Xterm. You may also be interested in the terminfo database, and in the ncurses library. And anyway, 99.9% of the time the cursor is on the last line of the terminal...
â€“Â AlexP
Nov 11 '17 at 20:16

@AlexP thanks! If you post your comment as an answer, I'll accept it.
â€“Â snahor
Nov 11 '17 at 20:56

add a commentÂ |Â

up vote
-1
down vote

favorite

Example:

$ ls
foo bar baz
$ (cursor is here)
.
.

This terminal has 5 rows. The "current row" is 3 and the number of available rows/blank lines after the cursor is 2.

edited Nov 11 '17 at 20:10

asked Nov 11 '17 at 18:48

snahor

1022

2

What exactly do you mean by available (not used)? Do you mean blank lines below the cursor? It would also be useful to show what you've already researched so far.
â€“Â Anthony Geoghegan
Nov 11 '17 at 18:57

As per this part of your question: "* ... the number of rows available... of the current row ...*": what is your definition of "current"? I.e. isn't that like "the row being processed"? If so, then that is always 1. Must be me who doesn't get it ...
â€“Â Pierre.Vriens
Nov 11 '17 at 18:59

Anthony Geoghegan: yes, that's what I need. Pierre.Vriens: I've added an example.
â€“Â snahor
Nov 11 '17 at 20:16

2

Depends on the terminal, obviously. Nowaday, most people say "terminal" when they mean a "terminal emulator", and most terminal emulators are more or less compatible with Xterm. Read the escape sequences understood by Xterm. You may also be interested in the terminfo database, and in the ncurses library. And anyway, 99.9% of the time the cursor is on the last line of the terminal...
â€“Â AlexP
Nov 11 '17 at 20:16

@AlexP thanks! If you post your comment as an answer, I'll accept it.
â€“Â snahor
Nov 11 '17 at 20:56

add a commentÂ |Â

up vote
-1
down vote

favorite

Example:

$ ls
foo bar baz
$ (cursor is here)
.
.

This terminal has 5 rows. The "current row" is 3 and the number of available rows/blank lines after the cursor is 2.

edited Nov 11 '17 at 20:10

asked Nov 11 '17 at 18:48

snahor

1022

Example:

$ ls
foo bar baz
$ (cursor is here)
.
.

This terminal has 5 rows. The "current row" is 3 and the number of available rows/blank lines after the cursor is 2.

edited Nov 11 '17 at 20:10

asked Nov 11 '17 at 18:48

snahor

1022

edited Nov 11 '17 at 20:10

asked Nov 11 '17 at 18:48

snahor

1022

asked Nov 11 '17 at 18:48

snahor

1022

asked Nov 11 '17 at 18:48

snahor

1022

2

What exactly do you mean by available (not used)? Do you mean blank lines below the cursor? It would also be useful to show what you've already researched so far.
â€“Â Anthony Geoghegan
Nov 11 '17 at 18:57

As per this part of your question: "* ... the number of rows available... of the current row ...*": what is your definition of "current"? I.e. isn't that like "the row being processed"? If so, then that is always 1. Must be me who doesn't get it ...
â€“Â Pierre.Vriens
Nov 11 '17 at 18:59

Anthony Geoghegan: yes, that's what I need. Pierre.Vriens: I've added an example.
â€“Â snahor
Nov 11 '17 at 20:16

2

Depends on the terminal, obviously. Nowaday, most people say "terminal" when they mean a "terminal emulator", and most terminal emulators are more or less compatible with Xterm. Read the escape sequences understood by Xterm. You may also be interested in the terminfo database, and in the ncurses library. And anyway, 99.9% of the time the cursor is on the last line of the terminal...
â€“Â AlexP
Nov 11 '17 at 20:16

@AlexP thanks! If you post your comment as an answer, I'll accept it.
â€“Â snahor
Nov 11 '17 at 20:56

add a commentÂ |Â

2

What exactly do you mean by available (not used)? Do you mean blank lines below the cursor? It would also be useful to show what you've already researched so far.
â€“Â Anthony Geoghegan
Nov 11 '17 at 18:57

As per this part of your question: "* ... the number of rows available... of the current row ...*": what is your definition of "current"? I.e. isn't that like "the row being processed"? If so, then that is always 1. Must be me who doesn't get it ...
â€“Â Pierre.Vriens
Nov 11 '17 at 18:59

Anthony Geoghegan: yes, that's what I need. Pierre.Vriens: I've added an example.
â€“Â snahor
Nov 11 '17 at 20:16

2

Depends on the terminal, obviously. Nowaday, most people say "terminal" when they mean a "terminal emulator", and most terminal emulators are more or less compatible with Xterm. Read the escape sequences understood by Xterm. You may also be interested in the terminfo database, and in the ncurses library. And anyway, 99.9% of the time the cursor is on the last line of the terminal...
â€“Â AlexP
Nov 11 '17 at 20:16

@AlexP thanks! If you post your comment as an answer, I'll accept it.
â€“Â snahor
Nov 11 '17 at 20:56

What exactly do you mean by available (not used)? Do you mean blank lines below the cursor? It would also be useful to show what you've already researched so far.
â€“Â Anthony Geoghegan
Nov 11 '17 at 18:57

As per this part of your question: "* ... the number of rows available... of the current row ...*": what is your definition of "current"? I.e. isn't that like "the row being processed"? If so, then that is always 1. Must be me who doesn't get it ...
â€“Â Pierre.Vriens
Nov 11 '17 at 18:59

Anthony Geoghegan: yes, that's what I need. Pierre.Vriens: I've added an example.
â€“Â snahor
Nov 11 '17 at 20:16

Depends on the terminal, obviously. Nowaday, most people say "terminal" when they mean a "terminal emulator", and most terminal emulators are more or less compatible with Xterm. Read the escape sequences understood by Xterm. You may also be interested in the terminfo database, and in the ncurses library. And anyway, 99.9% of the time the cursor is on the last line of the terminal...
â€“Â AlexP
Nov 11 '17 at 20:16

@AlexP thanks! If you post your comment as an answer, I'll accept it.
â€“Â snahor
Nov 11 '17 at 20:56

add a commentÂ |Â

1 Answer
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up vote
3
down vote

Try this:

#!/bin/bash

if ! termios="$(stty -g 2>/dev/null)" 
then
 echo "ERROR: Not running in a terminal"
 exit 1
fi


# Get max rows and columns
maxrows=$(tput lines)
maxcols=$(tput cols)

# Disable ICANON ECHO
stty -icanon -echo

# Get cursor position
tput u7
read -d "R" rowcol

# Revert to original settings
stty "$termios"

# clean up response
rowcol="$rowcol//[^0-9;]/"
rowcol="$rowcol//;/ "

printf 'maxrows: %d maxcols: %d currow: %d curcol: %dn' $maxrows $maxcols $rowcol[0] $rowcol[1]

exit 0

answered Nov 12 '17 at 5:50

fpmurphy1

2,231915

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1 Answer
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1 Answer
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oldest

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up vote
3
down vote

Try this:

#!/bin/bash

if ! termios="$(stty -g 2>/dev/null)" 
then
 echo "ERROR: Not running in a terminal"
 exit 1
fi


# Get max rows and columns
maxrows=$(tput lines)
maxcols=$(tput cols)

# Disable ICANON ECHO
stty -icanon -echo

# Get cursor position
tput u7
read -d "R" rowcol

# Revert to original settings
stty "$termios"

# clean up response
rowcol="$rowcol//[^0-9;]/"
rowcol="$rowcol//;/ "

printf 'maxrows: %d maxcols: %d currow: %d curcol: %dn' $maxrows $maxcols $rowcol[0] $rowcol[1]

exit 0

answered Nov 12 '17 at 5:50

fpmurphy1

2,231915

add a commentÂ |Â

up vote
3
down vote

Try this:

#!/bin/bash

if ! termios="$(stty -g 2>/dev/null)" 
then
 echo "ERROR: Not running in a terminal"
 exit 1
fi


# Get max rows and columns
maxrows=$(tput lines)
maxcols=$(tput cols)

# Disable ICANON ECHO
stty -icanon -echo

# Get cursor position
tput u7
read -d "R" rowcol

# Revert to original settings
stty "$termios"

# clean up response
rowcol="$rowcol//[^0-9;]/"
rowcol="$rowcol//;/ "

printf 'maxrows: %d maxcols: %d currow: %d curcol: %dn' $maxrows $maxcols $rowcol[0] $rowcol[1]

exit 0

answered Nov 12 '17 at 5:50

fpmurphy1

2,231915

add a commentÂ |Â

up vote
3
down vote

Try this:

#!/bin/bash

if ! termios="$(stty -g 2>/dev/null)" 
then
 echo "ERROR: Not running in a terminal"
 exit 1
fi


# Get max rows and columns
maxrows=$(tput lines)
maxcols=$(tput cols)

# Disable ICANON ECHO
stty -icanon -echo

# Get cursor position
tput u7
read -d "R" rowcol

# Revert to original settings
stty "$termios"

# clean up response
rowcol="$rowcol//[^0-9;]/"
rowcol="$rowcol//;/ "

printf 'maxrows: %d maxcols: %d currow: %d curcol: %dn' $maxrows $maxcols $rowcol[0] $rowcol[1]

exit 0

answered Nov 12 '17 at 5:50

fpmurphy1

2,231915

Try this:

#!/bin/bash

if ! termios="$(stty -g 2>/dev/null)" 
then
 echo "ERROR: Not running in a terminal"
 exit 1
fi


# Get max rows and columns
maxrows=$(tput lines)
maxcols=$(tput cols)

# Disable ICANON ECHO
stty -icanon -echo

# Get cursor position
tput u7
read -d "R" rowcol

# Revert to original settings
stty "$termios"

# clean up response
rowcol="$rowcol//[^0-9;]/"
rowcol="$rowcol//;/ "

printf 'maxrows: %d maxcols: %d currow: %d curcol: %dn' $maxrows $maxcols $rowcol[0] $rowcol[1]

exit 0

answered Nov 12 '17 at 5:50

fpmurphy1

2,231915

answered Nov 12 '17 at 5:50

fpmurphy1

2,231915

answered Nov 12 '17 at 5:50

fpmurphy1

2,231915

answered Nov 12 '17 at 5:50

fpmurphy1

2,231915

add a commentÂ |Â

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