touch – Change File Timestamps
Summary :
Update the access and modification times of each FILE to the current time. Also used to create a file.
Examples :
$ touch myfile — change the time stamp to current time. If myfile is not there then touch will create it.
$ touch -c myfile — Same as above. But If myfile is not there, then it won’t create it.
$ touch -r f1 f2 — Set f1’s time to f2 instead of current time
$ touch -a myfile — Change only access time.
$ touch -m myfile — change only the modification time
$ touch -t 200412251122.33 — set this time instead of current time
$ ls -lu myfile — Shows the last access time
Read : man touch