cat

Print and concatenate files. More information: https://www.gnu.org/software/coreutils/cat.

cat path/to/file

cat path/to/file1 path/to/file2 ... > path/to/output_file

cat path/to/file1 path/to/file2 ... >> path/to/output_file

cat - > path/to/file

cat -n path/to/file

cat -v -t -e path/to/file