¿Cómo puedo desplazarme dentro de la salida de mi comando watch?
Uso el comando watch para ver cómo cambia el contenido de mi directorio a medida que se ejecuta un script en él (a través de watch ls dir/)
Es una gran herramienta, excepto que parece que no puedo desplazarme hacia abajo o hacia arriba para ver todo el contenido una vez que el número de entradas llena la longitud vertical de la pantalla.
¿Hay alguna forma de hacer esto?
watch es genial, pero esta es una de las cosas que no puede hacer. Puede usar tail para mostrar las últimas entradas:
watch "ls -rtx dir/ | tail -n $(($LINES - 2))"
He creado un pequeño programa que hace exactamente lo que quieres en Python. Encuéntralo aquí , se llama pwatch.
He creado un programa bash ** swatch ** que hace exactamente lo que quieres en bash. En el video gif, puede ver cómo desplazarse por un archivo mmio cambiante.
#!/bin/bash
#
# watch a file and scroll
#
# keys => arrow-up/down, page-up/down, pos1, end
#
# usages:
# swatch -n <timeout_watch> <file>
# swatch <file>
#
# version: 1.1
# dependencies: awk , tput , clear, read
# published: https://unix.stackexchange.com/questions/3842/how-can-i-scroll-within-the-output-of-my-watch-command
# gif recording: peek , https://github.com/phw/peek
#
# =============================================
# KEYCODES
# =============================================
# https://unix.stackexchange.com/questions/294908/read-special-keys-in-bash
# showkey -a
# =============================================
# DEFAULTS
# =============================================
fname=""
line_show_begin=1
line_show_begin_last=-1
console_lines_correction=4
timeout_watch=2
timeout_read=.1
# =============================================
# DEFINE Escape-Sequences
# =============================================
# http://ascii-table.com/ansi-escape-sequences-vt-100.php
ESC_clr_line='\033[K'
ESC_reset_screen='\033c'
ESC_clr_screen='\033[2J'
ESC_cursor_pos='\033[0;0f'
ESC_cursor_home='\033[H'
# =============================================
# FUNCTIONS
# =============================================
function fn_help() {
cat << EOF
Usage: ./$0 [-n <timeout>] [<file>] , timeout >0.1s , default 2s
EOF
}
function get_options() {
[[ "$1" == "" ]] && { fn_help ; exit 1 ; }
while [ -n "$1" ]; do
case "$1" in
-h|--help)
fn_help
;;
-n)
[[ "$2" == "" ]] && { echo "Error: option -n required <timeout>" ; exit 1 ; }
if [[ "$(echo "$2<0.1"|bc)" == "0" ]] ; then
timeout_watch="$2"
shift
else
echo "Error: timeout <0.1 not allowed"
exit 1
fi
;;
-*)
echo "Error: unknown option »$1«"
exit 1
;;
*)
if [[ -f "$1" ]] ; then
fname=$1
else
echo "Error: file not found »$1«"
exit 1
fi
;;
esac
shift
done
[[ "$fname" == "" ]] && { echo "Error: file required" ; exit 1 ; }
}
function fn_print_headline() {
hdl_txt_right="${HOSTNAME}: $(date "+%Y-%m-%d %H:%M:%S")"
hdl_txt_left="$fname , ${timeout_watch}s , $line_show_begin"
hdl_txt_left_length=${#hdl_txt_left}
printf '%s%*s\n\n' "$hdl_txt_left" "$(($console_columns-$hdl_txt_left_length))" "$hdl_txt_right"
}
function fn_print_file() {
# ---------------------------------------------------
# file lenght can change while watch
# ---------------------------------------------------
lines_fname=$(awk 'END {print NR}' $fname)
line_last=$(($lines_fname-$console_lines))
(( "$line_last" < "1" )) && { line_last=1; clear; }
(( "$line_show_begin" > "$line_last" )) && { line_show_begin=$line_last; clear; }
# ---------------------------------------------------
# print postion changed
# ---------------------------------------------------
if (( "$line_show_begin" != "$line_show_begin_last" )) ; then
line_show_begin_last=$line_show_begin;
clear
else
printf $ESC_cursor_home
fi
# ---------------------------------------------------
# print file section
# ---------------------------------------------------
fn_print_headline
awk -v var1="$line_show_begin" -v var2="$console_lines" 'NR>=var1 {if (NR>var1+var2) {exit 0} else {printf "%s\n",$0 } }' $fname
}
function fn_console_size_change() {
console_columns=$(tput cols)
console_lines=$(($(tput lines)-$console_lines_correction))
line_show_begin_last=-1
}
function fn_quit() {
echo "quit" $0 , $?
setterm -cursor on ; exit 0
}
# =============================================
# GET OPTIONS
# =============================================
get_options "[email protected]" # pass all arguments with double-quotes
# =============================================
# INIT TRAP
# =============================================
trap "fn_console_size_change" SIGWINCH # https://en.wikipedia.org/wiki/Signal_(IPC)#SIGWINCH
trap "fn_quit" INT TERM EXIT
# =============================================
# MAIN
# =============================================
fn_console_size_change
setterm -cursor off
while true ; do
fn_print_file
read -rsn1 -t $timeout_watch k # char 1
case "$k" in
[[:graph:]])
# Normal input handling
;;
$'\x09') # TAB
# Routine for selecting current item
;;
$'\x7f') # Back-Space
# Routine for back-space
;;
$'\x01') # Ctrl+A
# Routine for ctrl+a
;;
$'\x1b') # ESC
read -rsn1 k # char 2
[[ "$k" == "" ]] && return Esc-Key
[[ "$k" == "[" ]] && read -rsn1 -t $timeout_read k # char 3
[[ "$k" == "O" ]] && read -rsn1 -t $timeout_read k # char 3
case "$k" in
A) # Arrow-Up-Key
(( "$line_show_begin" > "1" )) && line_show_begin=$(($line_show_begin-1))
;;
B) # Arrow-Down-Key
(( "$line_show_begin" < "$line_last" )) && line_show_begin=$(($line_show_begin+1))
;;
H) # Pos1-Key
line_show_begin=1
;;
F) # End-Key
line_show_begin=$line_last
;;
5) # PgUp-Key
read -rsn1 -t $timeout_read k # char 4
if [[ "$k" == "~" ]] && (( "$line_show_begin" > "$(($console_lines/2))" )) ; then
line_show_begin=$(($line_show_begin-$console_lines/2))
else
line_show_begin=1
fi
;;
6) # PgDown-Key
read -rsn1 -t $timeout_read k # char 4
if [[ "$k" == "~" ]] && (( "$line_show_begin" < "$(($line_last-$console_lines/2))" )) ; then
line_show_begin=$(($line_show_begin+$console_lines/2))
else
line_show_begin=$line_last
fi
;;
esac
read -rsn4 -t $timeout_read # Try to flush out other sequences ...
;;
esac
done
Puede usar watchall python package; su uso es el mismo que watch.
Sudo pip install watchall