Commands using dir

A lot of files in one dir is not so cool for filesystem.

You can redirect the pipe to > file.txt

See more here: http://ss64.com/nt/dir.html

Broaden your knowledge of the utilities available to you in no particular order whatsoever! Then use that knowledge to create more nifty one-liners that you can post here. =p

Takes a random number modulo the number of files in $dir, prints the filename corresponding to that number, and passes it as an argument to man.

This will search all directories and ignore the CVS ones. Then it will search all files in the resulting directories and act on them.

This may seem like a long command, but it is great for making sure all file permissions are kept in tact. What it is doing is streaming the files in a sub-shell and then untarring them in the target directory. Please note that the -z command should not be used for local files and no perfomance increase will be visible as overhead processing (CPU) will be evident, and will slow down the copy.

You also may keep simple with, but you don't have the progress info:

This command defragment the SQLite databases found in the home folder of the current Windows user.

This is usefull to speed up Firefox startup.

The executable sqlite3.exe must be located in PATH or in the current folder.

In a script use:

The original didn't use -print0 which fails on weird file names eg with spaces.

The original parsed the output of 'ls -l' which is always a bad idea.

The command gives size of all files smaller than 1024k, this information, together with disk usage, can help determin file system parameter (e.g. block size) or storage device (e.g. SSD v.s. HDD).

Note if you use awk instead of "cut| dc", you easily breach maximum allowed number of records in awk.

Useful if a different user cannot access some directory and you want to know which directory on the way misses the x bit.

there is no explicit find command in DOS you can create a batch file with this one and find all jpegs on the C drive ...

note: if creating a batch file "find.bat" the syntax changes to:

you can then use

I needed to get a feel for how "old" different websites were, based on their directories.

Sometimes you want to know the summary of the sizes of directories without seeing the details in their subdirectories. Especially if it is going to just scroll off the screen. This one liner summarizes the disk usage of any number of directories in a directory without giving all the details of whats happening underneath.

For use in scripts this command is very usefull