useful find commands in Linux

linux_find_command

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How To Use Find and Locate to Search for Files on a Linux 
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Source : www.digitalocean.com/community/tutorials/how-to-use-find-and-locate-to-search-for-files-on-a-linux-vps

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BY NAME:
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find -iname "FILENAME"                          # 'iname' is to ignore case sensitivity

find -not -name "FILENAME_TO_AVOID"             # Find all files expecpting a particular file
or 
find \! -name "FILENAME_TO_AVOID"

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BY TYPE:
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find -type type_descriptor FILENAME
Some most common descriptors:

f: regular file

d: directory

l: symbolic link

c: character devices

b: block devices


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BY SIZE:
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find / -size 50c                            # File size 50 bytes in root direcotry
find / -size +70M                           # File size more than 70 MB in root directory
find / -size -10G                           # File size less than 10 GB in root directory


These are some popular options:

c: bytes

k: Kilobytes

M: Megabytes

G: Gigabytes

b: 512-byte blocks


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BY TIME:
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-atime        Access Time: Last time a file was read or written to.

-mtime        Modification Time: Last time the contents of the file were modified.

-ctime        Change Time: Last time the file's inode meta-data was changed.

find / -mtime 1                         # Files modified 1 day ago

find / -atime -1                        # Files accessed less than 1 day ago

find / -ctime +3                        # Files changed more than 3 days ago

find / -mmin -1             ************ 'mmin' to specify minutes instead of days

find / -newer FILENAME      ************ Newer files after FILENAME


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BY OWNER:
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find / -user syslog                     # Files owned by user syslog

find / -group shadow                    # Files owned by grop shadow


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BY PERMISSION:
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find / -perm 644                        # Files that have permission 644

find / -perm -644                       # Files that have at least 644 permission


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BY DEPTH:
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Maximum depth of the search under the top-level search directory:

find -maxdepth num -name query

Minimum depth of the search under the top-level search directory:

find -mindepth num -name query


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Executing and Combining Find Commands:
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find find_parameters -exec command_and_params {} \;

find . -type d -perm 755 -exec chmod 700 {} \;          # Find and change directory permission


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To chain different results together, you can use the "-and" or "-or" commands. The "-and" is assumed if omitted:
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find . -name file1 -or -name file2