find和grep区别

在使用linux时，经常需要进行文件查找。其中查找的命令主要有find和grep。两个命令是有区的。

　　区别：(1)find命令是根据文件的属性进行查找，如文件名，文件大小，所有者，所属组，是否为空，访问时间，修改时间等。

(2)grep是根据文件的内容进行查找，会对文件的每一行按照给定的模式(patter)进行匹配查找。

使用方法：

grep --help
BusyBox v1.26.2 (2019-12-27 14:43:11 CST) multi-call binary.Usage: grep [-HhnlLoqvsriwFE] [-m N] [-A/B/C N] PATTERN/-e PATTERN.../-f FILE [FILE]...Search for PATTERN in FILEs (or stdin)-H      Add 'filename:' prefix-h      Do not add 'filename:' prefix-n      Add 'line_no:' prefix-l      Show only names of files that match-L      Show only names of files that don't match-c      Show only count of matching lines-o      Show only the matching part of line-q      Quiet. Return 0 if PATTERN is found, 1 otherwise-v      Select non-matching lines-s      Suppress open and read errors-r      Recurse-i      Ignore case-w      Match whole words only-x      Match whole lines only-F      PATTERN is a literal (not regexp)-E      PATTERN is an extended regexp-m N    Match up to N times per file-A N    Print N lines of trailing context-B N    Print N lines of leading context-C N    Same as '-A N -B N'-e PTRN Pattern to match-f FILE Read pattern from file

Usage: find [-HL] [PATH]... [OPTIONS] [ACTIONS]Search for files and perform actions on them.
First failed action stops processing of current file.
Defaults: PATH is current directory, action is '-print'-L,-follow      Follow symlinks-H              ...on command line only-xdev           Don't descend directories on other filesystems-maxdepth N     Descend at most N levels. -maxdepth 0 appliesactions to command line arguments only-mindepth N     Don't act on first N levels-depth          Act on directory *after* traversing itActions:( ACTIONS )     Group actions for -o / -a! ACT           Invert ACT's success/failureACT1 [-a] ACT2  If ACT1 fails, stop, else do ACT2ACT1 -o ACT2    If ACT1 succeeds, stop, else do ACT2Note: -a has higher priority than -o-name PATTERN   Match file name (w/o directory name) to PATTERN-iname PATTERN  Case insensitive -name-path PATTERN   Match path to PATTERN-ipath PATTERN  Case insensitive -path-regex PATTERN  Match path to regex PATTERN-type X         File type is X (one of: f,d,l,b,c,...)-perm MASK      At least one mask bit (+MASK), all bits (-MASK),or exactly MASK bits are set in file's mode-mtime DAYS     mtime is greater than (+N), less than (-N),or exactly N days in the past-mmin MINS      mtime is greater than (+N), less than (-N),or exactly N minutes in the past-newer FILE     mtime is more recent than FILE's-inum N         File has inode number N-user NAME/ID   File is owned by given user-group NAME/ID  File is owned by given group-size N[bck]    File size is N (c:bytes,k:kbytes,b:512 bytes(def.))+/-N: file size is bigger/smaller than N-links N        Number of links is greater than (+N), less than (-N),or exactly N-prune          If current file is directory, don't descend into itIf none of the following actions is specified, -print is assumed-print          Print file name-print0         Print file name, NUL terminated-exec CMD ARG ; Run CMD with all instances of {} replaced byfile name. Fails if CMD exits with nonzero-exec CMD ARG + Run CMD with {} replaced by list of file names-delete         Delete current file/directory. Turns on -depth option

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