Paste #273545

cp file.txt file_copy.txt; FILE_SUM=`md5sum file.txt`; FILE_COPYSUM=`md5sum file.txt`; if [[ "$FILE_SUM" = "$FILE_COPYSUM" ]]; then echo "КОПИЯ ЕСТЬ!"; fi; echo  "New string" > file.txt; cat file_copy.txt >> file.txt; cat file.txt