Error summary

When I pressed tab to move the directory with cd, I got the message bash: cannot create temp file for here-document: No space left on device many times. When I read English well, I found that it was full of discs, so I responded.

The environment is Ubuntu (18.04).

Correspondence

1. Check the total disk capacity

Calm down and check the disk space with the df command. By adding the -h option, the capacity is displayed in an easy-to-read state.

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev             16G     0   16G   0% /dev
tmpfs           3.2G  114M  3.1G   4% /run
/dev/sda2       219G  208G     0 100% /
tmpfs            16G  784K   16G   1% /dev/shm
(Omitted below

It is almost full with / dev / sda2 219G 208G 0 100% /, and it is necessary to reduce the capacity here.

2. Identify the cause file

Use the du command to see which files are larger, traversing the directories in order from the root directory. The command to use is as follows.

sudo du -sh *

If you simply type du, a huge file capacity will be displayed, and the capacity display is also difficult to understand. The above commands are supported by the following methods.

--Change capacity to readable with -h option --The -s option does not include subdirectories. --If there are files that cannot be accessed, use sudo so that you can check the file size. --By adding *, the size of the directory and files directly under the current directory is displayed (otherwise, the size of the current directory).

It is also possible to display in order of capacity by using sort. However, in this case, it did not sort correctly in my environment with -h, so I used the following command.

du -s * | sort -nr

Use -n to sort the numbers and -r to reverse the order so that the larger capacity comes first.

If you can identify a large file and confirm that it can be deleted, delete it and you are done.

bonus

You can also use head and sort together to sort a few lines in order from the largest file.

du |sort -nr | head -n 5

However, of course, if it is a large file, it is not possible to delete it immediately, so in the end I think that I will search for a directory file that can be deleted steadily.

reference

-What to do when the disk is full on Linux -[[Du] command-Display disk usage: Linux basic command Tips (59)-@IT](https://www.atmarkit.co.jp/ait/articles/1610/25/news016. html) -[[Sort] command-Sort text files line by line: Linux basic command Tips (63)-@IT](https://www.atmarkit.co.jp/ait/articles/1611/09/news020 .html)