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The following touch command example will update the time-stamp of file a.txt with the time-stamp of tgs.txt file. You can also take a file as a reference, and update the time for other files, so that both file will hold the same time. One of benefit of sparse file is that it does not consume much disk space and read operation on that file would be quite fast. Sparse is a regular file which contains long sequence of zero bytes that doesn’t consume any physical disk block. Copy the Time-stamp from Another File using -r Example:16) Copy sparse files using sparse option in cp command. You can also use a string to change the timeĪnother example: $ touch -d " 12:12:12.000000000 +0530" tgs.txtįor developers, touch command will be really helpful when you are working with Makefiles 5. Size: 3 Blocks: 8 IO Block: 4096 regular file Verify the above change using stat command: $ stat tgs.txt It is not possible to set the date beyond January 18, 2038.įor example: $ touch -a -m -t 203801181205.09 tgs.txt If the value of the YY is between 00 and 37, the value of the CC digits is assumed to be 20. If the value of the YY is between 70 and 99, the value of the CC digits is assumed to be 19.
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Instead of taking the current time-stamp, you can explicitly specify the time using -t and -d options. In Java easiest way to create new file of Zero byte just like unix touch commanad is using touch method of FileUtils class of Apache Commons IO Java library. How do I touch a file in Unix The touch command is a standard program for Unix/Linux operating systems, that is used to create, change and modify timestamps of a file. Explicitly Setting Access and Modification time using -t and -d Zero-byte files may arise in cases where a program creates a file but aborts or is interrupted prematurely while writing to it. NOTE: It is not possible to change the ctime using touch command 4. The above method can be used to change the mtime of all obj files, when using make utility. You can change the modification time of a file using -m option. By default it will take the current system time and update the atime field.īefore touch command is executed: $ stat tgs.txt
LINUX COMMAND TO CREATE A ZERO BYTE FILE ZIP
Each file is stored in a single file with the zip command in Linux is usually supported by almost all operating systems like MSDOS, OS/2, Window NT, Minix, and Macintosh, etc. We can change the access time of a file using -a option. ZIP is a file packaging utility compression technique in Unix.