用于在至少三个命令之间切换的脚本

用于在至少三个命令之间切换的脚本

如何编写一个 bash 脚本,当使用键绑定调用时,该脚本将在各种命令之间切换(例如,下面显示的 4 个不同命令)。

该脚本应该记住上次调用它时停止在哪个命令上,并且能够在至少三个命令之间切换。

feh例如,我想使用如下所示在四个屏幕壁纸之间切换,我该怎么做?

feh --bg-scale $dir_photos/20150620_182419_1.jpg
feh --bg-scale $dir_photos/20150620_182419_2.jpg
feh --bg-scale $dir_photos/20150620_182419_3.jpg
feh --bg-scale $dir_photos/20150620_182419_4.jpg

答案1

据我了解您的问题,您希望同一命令在每次调用时产生不同的输出,以便您按顺序循环遍历四个不同的文件。

为此,您需要维护状态,以便知道下一次调用需要什么。在我的示例中,我将保存当前壁纸的索引号 (0..3)。当索引号达到可用文件的数量时,它会使用模 ( %) 运算符重置为零。

#!/bin/bash
#
files=(20150620_182419_1.jpg 20150620_182419_2.jpg 20150620_182419_3.jpg 20150620_182419_4.jpg)
dir_photos="$HOME/Pictures"          # Directory of photos
state="$HOME/.${0##*/}.dat"          # File to maintain state

index=$(cat "$state" 2>/dev/null)    # Retrieve last index
nFiles=${#files[@]}                  # Number of entries in files()

# Set current index to zero if first time, otherwise next value in sequence
[[ -z "$index" ]] && index=0 || index=$((++index % nFiles))

printf "%d\n" $index >"$state"       # Save new index
# echo "State index=$index: ${files[index]}"

# Apply the wallpaper
feh --bg-scale "$dir_photos/${files[index]}"

将其保存为文件并使其可执行。然后绑定你的密钥来调用这个脚本。

您可以修改它以迭代$dir_photos目录中的所有文件:

dir_photos="$HOME/Pictures"          # Directory of photos
files=("$dir_photos"/*)              # All files in the directory
...
feh --bg-scale "${files[index]}"

答案2

这是我的解决方案。我想我可以在后台运行这个小循环,并将每个选项连接到一个热键,这是我的初衷,但我不知道如何通过热键连接到后台进程。

#!/bin/bash

# set an infinite loop until option is set and quit

while :
do
    clear
    
    # display menu
    echo "  --------------------------------------------------"
    echo "     W A L L P A P E R   C H A N G E R - M E N U"
    echo "  --------------------------------------------------"
    echo
    echo "  1   wall paper 1"
    echo
    echo "  2   edit wall paper 1"
    echo
    echo "  3   wall paper 2"
    echo
    echo "  4   wall paper 3"
    echo
    echo "  5   wall paper changer - does not work yet"
    echo
    echo "  6   this script: pcmanfm to dir location"
    echo
    echo "  7   this script: edit this script"
    echo
    echo "  8   display network connections"
    echo
    echo "  q   exit"
    echo
    echo

    # set-up reference directories

    dir_z="/home/$USER/Dropbox/script_screen_SAVER_feh"
    dir_photos="/home/$USER/wall_papers"

    # get input from the user 
    read -p "  enter your choice [ 1 - 7  or   q/Q ] " choice
        
    # make decision using case..in..esac 
    case $choice in
        1)
            feh --bg-scale $dir_photos/20210620_182419_3.jpg
            echo "wall paper 1"
            exit 0
            ;;
        2)
            gimp $dir_photos/20210620_182419_3.xcf
            echo "wall paper 1, edit image"
            ;;
        3) 
            feh --bg-scale $dir_photos/20210620_182419_1.jpg
            echo "Quotes"
            exit 0
            ;;
        4) 
            feh --bg-scale $dir_photos/20210621_135308.jpg
            echo "The sea - wall paper"
            exit 0
            ;;
        5)
            # kill previously running wallpaper changer process
            ps aux | grep "feh/" | awk '{print $2}' | xargs kill -15
            # change the wallpaper every 5 seconds
            bash -c 'while : ;do feh --randomize --bg-fill --auto-rotate $dir_photos/*.jpg; sleep 5; done' &
            disown
            echo "wall paper changer"
            exit 0
            ;;
        6) 
            pcmanfm $dir_photos
            echo "pcmanfm directory"
            ;;
        7) 
                        nvim $dir_z/more_than_3_screens_switcher.sh
            echo "editing this script"
            ;;
        8)
            netstat -nat
            read -p "Press [Enter] key to continue..." readEnterKey
            ;;
        q)
            echo "Bye!"
            exit 0
            ;;
        Q)
            echo "Bye!"
            exit 0
            ;;      *)
            echo "Error: Invalid option..." 
            ;;


    esac        
                
done

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