Question

I’d like to find human-readable files on my Linux machine without a file extension constraint. Those files should be readable by humans using a text editor, for example: text, configuration, HTML, and source code files.

Is there a way to filter and locate them?

Answer 1

find and file are your friends here:

find /dir/to/search -type f -exec sh -c 'file -b {} | grep text &>/dev/null' \; -print

This will find any files (NOTE: it will not find symlinks directories sockets, etc., only regular files) in /dir/to/search and run sh -c ‘file -b {} | grep text &>/dev/null’ ; which looks at the type of file and looks for text in the description. If this returns true (i.e., text is in the line) then it prints the filename.

NOTE: using the -b flag to file means that the filename is not printed and therefore cannot create any issues with the grep. E.g., without the -b flag the binary file gettext would erroneously be detected as a textfile.

For example,

root@osdevel-pete# find /bin -exec sh -c 'file -b {} |  grep text &>/dev/null' \; -print
/bin/gunzip
/bin/svnshell.sh
/bin/unicode_stop
/bin/unicode_start
/bin/zcat
/bin/redhat_lsb_init
root@osdevel-pete# find /bin -type f -name *text*
/bin/gettext

If you want to look in compressed files use the --uncompress flag to file. For more information and flags to file see man file.