The shell cleans up old files before the specified number of days in the specified directory

Preface

We often generate a lot of temporary files when running some services on the server.
However, some temporary files can easily fill the entire disk by processing them from time to time;
Therefore, it is necessary to clean up regularly. Based on this requirement, we can create a script combinationcrontabOr service schedules to use these;

Script implementation

#!/bin/bash
# cleanup_old_files - Clean up old files before the specified number of days in the specified directory# $1: Directory name# $2: Days# $3: (optional) keyword to match file namesfunction cleanup_old_files() {
    local dir="$1"     # Directory name    local days="$2"    # days    local keyword="$3" # Keywords matching filename    # Parameter validity check    if [ -z "$dir" ]; then
        echo "Error: Directory parameter is empty."
        return 1
    fi
    if [ ! -d "$dir" ]; then
        echo "Error: Directory $dir does not exist."
        return 1
    fi
    if ! [[ "$days" =~ ^[0-9]+$ ]]; then
        echo "Error: The number of days parameter is invalid."
        return 1
    fi
    # If the number of days is not specified, the default is the same day    if [ -z "$days" ]; then
        days=0
    fi
    # Build a lookup command to distinguish based on the value of $days    if [ "$days" -eq 0 ]; then
        find_cmd="find -L \"$dir\" -type d -o -type f -mtime 0"
    else
        find_cmd="find -L \"$dir\" -type d -o -type f -mtime +$days"
    fi
    # If a keyword is specified, add it to the search command    if [ -n "$keyword" ]; then
        find_cmd+=" -name \"*$keyword*\""
    fi
    # Print the full command    echo "Execute the command: $find_cmd"
    # Perform search and delete files    if [ "$days" -eq 0 ]; then
        echo "Cleaning up the directory $dir Created on the same day$(if [ -n "$keyword" ]; then echo "Contains the keyword $keyword"; else echo "all "; fi)document..."
    else
        echo "Cleaning up the directory $dir middle $days Created a day ago$(if [ -n "$keyword" ]; then echo "Contains the keyword $keyword"; else echo "all "; fi)document..."
    fi
    # Delete the found file via -exec rm -rf {} +    if eval "$find_cmd -exec rm -v -rf {} +" &gt;/dev/null; then
        if [ "$days" -eq 0 ]; then
            echo "Deleted当天的旧document."
        else
            echo "Deleted $days 天之前的旧document."
        fi
    else
        echo "Deletion failed."
        return 1
    fi
}
# Example usage# cleanup_old_files "/path/to/directory" 30 "log"
# cleanup_old_files "/path/to/directory" 0 "log"

Summarize

Note 1: When mtime is 0

It is worth noting thatmtimeWhen it is 0, we want to simulate the day, and we cannot use modifiers (+/-);
The execution performance of Debian and MacOS is that there is no error, but there is no operation, so a distinction is made in the code;

Note 2: When /tmp is a soft chain

iffindIf you want to retrieve the contents in the command, please remember to bring it-L, otherwise nothing can be retrieved;

# Under mac tmp is a soft link to /private/tmpls -l /tmp
lrwxr-xr-x@ 1 root  wheel  11 Dec  2 19:37 /tmp -&gt; private/tmp

Bring it with you-LAfter that, it will be compatible with both Linux and MacOS platforms, making it convenient for local debugging and testing;

The general purpose of this parameter is to search for recursively, so symbolic links can also be retrieved;
If you don't have one, you will only look for hard links, and the symbolic links will be ignored directly.

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