Concatenate two files in loop-CodePudding

i try to concatenate two .txt in loops, here is the file

mn@LeNOVO-220414-A:/mnt/c/Users/LeNOVO/Alnus$ ls
Alnus1.txt  Alnus2.txt  Alnus3.txt  Alnus4.txt  Bobi1.txt  Bobi2.txt  Bobi3.txt  Bobi4.txt`

I try to combine Alnus1 and Bobi1 into a new file named combination1.txt

I am new in bash and need guidance I here is my failed trial, please take a look.

mn@LeNOVO-220414-A:/mnt/c/Users/LeNOVO/Alnus$ ls
Alnus1.txt  Alnus2.txt  Alnus3.txt  Alnus4.txt  Bobi1.txt  Bobi2.txt  Bobi3.txt  Bobi4.txt
mn@LeNOVO-220414-A:/mnt/c/Users/LeNOVO/Alnus$ for name in *1.txt
> do
> other = "${name/1/1}"
> cat "$name" "%other" > "$combination1"
> done
other: command not found
-bash: : No such file or directory
other: command not found
-bash: : No such file or directory

I try to combine Alnus1 and Bobi1 into a new file named combination1.txt

CodePudding user response：

This is probably what you're looking for:

for file in Alnus*.txt; do
    suffix=${file#Alnus}
    cat "$file" "Bobi$suffix" > "combination$suffix"
done

${file#Alnus} removes the string Alnus from the beginning of the value of the variable file.

CodePudding user response：

If you know exactly how many files there are, you can do this:

for i in {1..4}; do
        cat Alnus${i}.txt Bobi${i}.txt > combination${i}.txt
done

If you don't, you can use ls Alus*.txt | wc -l to make it work for any number of files (assuming you are always starting the cound from 1), like this:

for i in $(seq 1 $(ls Alnus*.txt | wc -l)); do
        cat Alnus${i}.txt Bobi${i}.txt > combination${i}.txt
done