Декларация функции в bash

bash --version 

bash -n <имя_твоего_скрипта>

$ PS1='... ' dash
... echo $SHELL
/bin/bash
... echo $0
dash
... cat /proc/$$/cmdline
dash...

function func_name {
    echo "do something"
}

$ bash --version
GNU bash, version 5.2.21(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ bash -n conv_test.sh 
$ 

#!/bin/bash

#set -x
for a in /home/user/Documents/Test\ Files/*;
	do
		filetype_is1 () {
			echo $(file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2)	
		}		

		if [ $(filetype_is1) = "directory" ]; then
			:
		else			
			if [ $(filetype_is1) = "Unicode" ]; then
				mv "$a" /home/user/Documents/Test\ Files/test/${a%}.converted
			else
				:
			fi
		fi
	done

for b in /home/user/Documents/Test\ Files/*;
	do
		filetype_is2 () {
			echo $(file "$b" |  cut -d ":" -f 2 | cut -d " " -f 2)	
		}	
		if [ $(filetype_is2) = "directory" ]; then
			:
		else
			iconv -f WINDOWS-1251 -t UTF-8 "$b" -o "${b%}.converted" && mv "${b%}.converted" /home/user/Documents/Test\ Files/test/
		
		fi
	done 

for c in /home/user/Documents/Test\ Files/*;
	do 
		filetype_is3 () {
			echo $(file "$c" |  cut -d ":" -f 2 | cut -d " " -f 2)	
		}
		if [ $(filetype_is3) = "directory" ]; then
			:
		elif [ $(filetype_is3) = "ISO-8859" ]; then
			rm "$c"
		else
			:
		fi	
	done
			
#set +x

$ ./conv_test.sh 
mv: target '10).txt.converted.converted': No such file or directory
mv: target '11).txt.converted.converted': No such file or directory
mv: target '3).txt.converted.converted': No such file or directory
mv: target '4).txt.converted.converted': No such file or directory
mv: target '5).txt.converted.converted': No such file or directory
mv: target '6).txt.converted.converted': No such file or directory
mv: target '7).txt.converted.converted': No such file or directory
mv: target '8).txt.converted.converted': No such file or directory
mv: target '9).txt.converted.converted': No such file or directory
mv: target '(Copy).txt.converted.converted': No such file or directory
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
iconv: illegal input sequence at position 388
$ 

./func_test.sh 
Starting script
slovo
Finished

 cat func_test.sh 
#!/bin/bash

function slovo {
    echo slovo
}

echo "Starting script"
slovo
echo "Finished"

		filetype_is3 () {
			echo $(file "$c" |  cut -d ":" -f 2 | cut -d " " -f 2)	
		}
		if [ $(filetype_is3) = "directory" ]; then

cat func_test.sh 
#!/bin/bash

function slovo {
    echo slovo
}

echo "Starting script"
slovo
result = $(slovo)
echo "Result $result"
echo "Finished"

./func_test.sh 
Starting script
slovo
./func_test.sh: line 9: result: command not found
Result 
Finished

$ cat ./test_func.sh 
#!/bin/bash

function test_echo {
	echo "It works!"
}

test_echo

$ ./test_func.sh 
It works!
$ 

find /foo/bar -maxdepth 1 -type f | while read f; do
    case $(file "$f" | cut -d: -f2 | cut -d' ' -f2) in
        Unicode) echo "moving $f";;
        ISO-8859) echo "deleting $f";;
        *) echo "converting $f -> $f.converted";;
    esac
done

#!/bin/bash

for a in /home/user/Documents/Test\ Files/*;
	do
		function filetype_is1 {
							
				echo $(file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2)	
		}		

		if [ $(filetype_is1) = "directory" ]; then
			:
		else			
			if [ $(filetype_is1) = "Unicode" ]; then
				mv "$a" /home/user/Documents/Test\ Files/test/${a%}.converted
			else
				:
			fi
		fi
	done

for b in /home/user/Documents/Test\ Files/*;
	do
		function filetype_is2 {
			echo $(file "$b" |  cut -d ":" -f 2 | cut -d " " -f 2)	
		}

		if [ $(filetype_is2) = "directory" ]; then
			:
		else
			iconv -f WINDOWS-1251 -t UTF-8 "$b" -o "${b%}.converted" && mv "${b%}.converted" /home/user/Documents/Test\ Files/test/
		
		fi
	done 

for c in /home/user/Documents/Test\ Files/*;
	do 
		function filetype_is3 {
			echo $(file "$c" |  cut -d ":" -f 2 | cut -d " " -f 2)	
		}
		if [ $(filetype_is3) = "directory" ]; then
			:
		elif [ $(filetype_is3) = "ISO-8859" ]; then
			rm "$c"
		else
			:
		fi	
	done

#!/bin/bash

for a in /home/user/Documents/Test\ Files/*
	do
		function filetype_is {
		       file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2
		}	
		if [ $(filetype_is) = "directory" ]; then
			:
		elif [ $(filetype_is) = "Unicode" ]; then			
			mv "$a" "/home/user/Documents/Test Files/test/"
		elif [ $(filetype_is) = "ISO-8859" ]; then
			iconv -f WINDOWS-1251 -t UTF-8 -o "${a%}.converted" "$a" && mv "${a%}.converted" /home/user/Documents/Test\ Files/test/ 
		else 
			:
		fi
	done

find /home/user/Documents/Test\ Files/ -maxdepth 1 -type f  -exec mv {} /home/user/Documents/Test\ Files/original\ files/ \;

#!/bin/bash

initial_folder="/home/$USER/Documents/Test Files/"
test_folder="/home/$USER/Documents/Test Files/test/"
originalFiles_folder="/home/$USER/Documents/Test Files/original files/"

for a in "$initial_folder"*
	do
		function filetype_is {
							
			file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2
		}		

		if [ $(filetype_is) = "directory" ]; then
			:
		elif [ $(filetype_is) = "Unicode" ]; then			
			mv "$a" "$test_folder"
		elif [ $(filetype_is) = "ISO-8859" ]; then
			iconv -f WINDOWS-1251 -t UTF-8 -o "${a%}.converted" "$a" && mv "${a%}.converted" "$test_folder" 
		else 
			:
		fi
	done

find "$initial_folder" -maxdepth 1 -type f  -exec mv {} "$originalFiles_folder" \;

#!/bin/bash

now=$(date -d "today" +"%Y%m%d%H%M")
initial_folder="/home/$USER/Documents/Test Files/"
test_folder="/home/$USER/Documents/Test Files/test"
originalFiles_folder="/home/$USER/Documents/Test Files/original files/"

for a in "$initial_folder"*
	do
		function filetype_is {
							
			file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2
		}		

		if [ $(filetype_is) = "directory" ]; then
			:
		elif [ $(filetype_is) = "Unicode" ]; then			
			mv "$a" "$a.$now" && mv "$a.$now" "$test_folder"
		elif [ $(filetype_is) = "ISO-8859" ]; then
			iconv -f WINDOWS-1251 -t UTF-8 -o "${a%}.$now.converted" "$a" && mv "${a%}.$now.converted" "$test_folder" 
		else 
			:
		fi
	done

find "$initial_folder" -maxdepth 1 -type f  -exec mv {} "$originalFiles_folder" \;

for a in "$initial_folder"*
	do
		function filetype_is {
							
			file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2
		}		

#!/bin/sh

# folder - это у Билла Гейтса на рабочем столе
# в unix - катологи (или директории)
src_dir="/home/$USER/Documents/Test Files"
dst_dir="/home/$USER/Documents/Test Files/test"

for path in "$src_dir"/*
do
    # ключ "-f" - файл существует и является обычным файлом
    # (не каталогом/директорией, не символьной ссылкой,
    # не именованным pipe, не файлом устройства и тп)
    if [ -f "$path" ]; then
        # не надо проверять, что это директория
        # 
        # получаем кодировку
        # man file
        encoding="$(file -b --mime-encoding "$path")"

        # switch или pattern matching
        case "$encoding" in
            iso-8859-1) # если $encoding == iso-8859-1
                # то выполнем этот блок до ";;"

                # man basename
                # "/путь/до/файла.txt" -> "файла.txt"
                file_name="$(basename "$path")"
                # собираем путь, куда запишем сконвертированный файл
                dst_path="$dst_dir/$file_name.converted"
                # конвертируем
                iconv -f WINDOWS-1251 -t UTF-8 "$path" -o "$dst_path"
                # всё, записали сразу куда надо
            ;;
            *)
                # встретили файл в неизвестной кодировке
                # ничего не делаем
                # этот блок "*) ... ;;" можно удалить, если ничего не надо делать
            ;;
        esac
    fi
done

#!/bin/bash

now=$(date -d "today" +"%Y%m%d%H%M")
initial_folder="$HOME/Documents/Test Files/"
test_folder="$HOME/Documents/Test Files/test"
originalFiles_folder="$HOME/Documents/Test Files/original files/"

for a in "$initial_folder"*
	do
		filetype_is=$(file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2)
		if [ $filetype_is = "directory" ]; then
			:
		elif [ $filetype_is = "Unicode" ]; then			
			mv "$a" "$a.$now" && mv "$a.$now" "$test_folder"
# не работает!			mv "$a" "$test_folder${a%}.$now"
		elif [ $filetype_is = "ISO-8859" ]; then
			iconv -f WINDOWS-1251 -t UTF-8 -o "${a%}.$now.converted" "$a" && mv "${a%}.$now.converted" "$test_folder"
# не работает!			iconv -f WINDOWS-1251 -t UTF-8 -o "$test_folder/${a%}.$now.converted" "$a" 
		else 
			:
		fi
	done

find "$initial_folder" -maxdepth 1 -type f  -exec mv {} "$originalFiles_folder" \;

for a in "$initial_folder"*

cd "$initial_folder"
for a in *

#!/bin/bash

now=$(date -d "today" +"%Y%m%d%H%M")
initial_folder="$HOME/Documents/Test Files/"
test_folder="$HOME/Documents/Test Files/test"
originalFiles_folder="$HOME/Documents/Test Files/original files/"

cd $initial_folder
for a in *
	do
		filetype_is=$(file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2)
		if [ $filetype_is = "directory" ]; then
			:
		elif [ $filetype_is = "Unicode" ]; then			
			mv "$a" "$test_folder${a%}.$now"
		elif [ $filetype_is = "ISO-8859" ]; then
			iconv -f WINDOWS-1251 -t UTF-8 -o "$test_folder/${a%}.$now.converted" "$a"
		else 
			:
		fi
	done

find "$initial_folder" -maxdepth 1 -type f  -exec mv {} "$originalFiles_folder" \;

#!/bin/bash

now=$(date -d "today" +"%Y%m%d%H%M")
initial_folder="$HOME/Documents/Test Files/"
test_folder="$HOME/Documents/Test Files/test"
originalFiles_folder="$HOME/Documents/Test Files/original files/"

cd "$initial_folder"

for a in *
	do
		filetype_is=$(file "$a" |  cut -d ":" -f 2 | cut -d " " -f 2)
		if [ $filetype_is = "directory" ]; then
			:
		elif [ $filetype_is = "Unicode" ]; then			
			mv "$a" "$test_folder/${a%}.$now"
		elif [ $filetype_is = "ISO-8859" ]; then
			iconv -f WINDOWS-1251 -t UTF-8 -o "$test_folder/${a%}.$now.converted" "$a"
		else 
			:
		fi
	done

find "$initial_folder" -maxdepth 1 -type f  -exec mv {} "$originalFiles_folder" \;