How to write the output of a file to the same file in Linux consoles?

Question

linux

For example, some
cat file | sort > file
File is overwritten in this case.

Answer 1

Answer 2

cat file | sort >> file?

Answer 3

What you want is possible in two ways:
1. cat file | sort > file.tmp; mv file.tmp file
2. Modifying a file via perl/sed/whatever-has-similar-features, launched with the -i option (actually they do the first step, but you don't see it)

Answer 4

This cannot be done because most programs are normal, and do not read the entire file at once, but use buffers for this, read a part, displayed, read a part, displayed.
To do what you want, you just need to find a program (option) that reads the entire file before outputting it.

Answer 5

and what prevents to save in a new file and then to make a concatenation?

Answer 6

f=`cat file`; echo "$f" >> file

Answer 7

Hurry up =) here's a solution for you:
sort file >> file
The sort command reads the entire file into memory before sorting, which is not surprising.

Answer 8

You can rename the file "file" to "_file", merge what you need into "file" and then delete "_file".