根据关键字查⽇志linux,linux通过grep根据关键字查⽇志
⽂件上下⽂
linux通过grep根据关键字查⽇志⽂件上下⽂
1、在标准unix/linux下的grep命令中，通过以下参数控制上下⽂的显⽰：
grep -C 10 keyword catalina.out 显⽰file⽂件中匹配keyword字串那⾏以及上下10⾏
grep -B 10 keyword catalina.out 显⽰keyword及前10⾏
grep -A 10 keyword catalina.out 显⽰keyword及后10⾏
2、查的结果⽐较⼤时，为了⽅便定位问题，也可以重定向到⽂件中，⽐如：
grep -C 10 keyword catalina.out  >
3、统计包含某个关键字的个数
grep -o keyword catalina.out | wc -l
4、如果⼀⾏最多⼀个关键字，可以简写为：
grep -c keyword catalina.out
5、查看grep版本的⽅法是
grep -V
Grep命令详细说明：
Usage: grep [OPTION]... PATTERN [FILE]...
Search for PATTERN in each FILE or standard input.
PATTERN is, by default, a basic regular expression (BRE).
Example: grep -i 'hello world' menu.h main.c
Regexp selection and interpretation:
-E, --extended-regexp    PATTERN is an extended regular expression (ERE)
-
F, --fixed-strings      PATTERN is a set of newline-separated fixed strings
-G, --basic-regexp        PATTERN is a basic regular expression (BRE)
-P, --perl-regexp        PATTERN is a Perl regular expression
-e, --regexp=PATTERN      use PATTERN for matching
-f, --file=FILE          obtain PATTERN from FILE
-i, --ignore-case        ignore case distinctions
-w, --word-regexp        force PATTERN to match only whole words
-x, --line-regexp        force PATTERN to match only whole lines
-z, --null-data          a data line ends in 0 byte, not newline
Miscellaneous:
-s, --no-messages        suppress error messages
-
v, --invert-match        select non-matching lines
-V, --version            display version information and exit
--help                display this help text and exit
Output control:
-m, --max-count=NUM      stop after NUM matches
-b, --byte-offset        print the byte offset with output lines
-n, --line-number        print line number with output lines
--line-buffered      flush output on every line
-H, --with-filename      print the file name for each match
-h, --no-filename        suppress the file name prefix on output
--label=LABEL        use LABEL as the standard input file name prefix
-
o, --only-matching      show only the part of a line matching PATTERN -q, --quiet, --silent    suppress all normal output
--binary-files=TYPE  assume that binary files are TYPE;
TYPE is 'binary', 'text', or 'without-match'
-a, --text                equivalent to --binary-files=text
-I                        equivalent to --binary-files=without-match
-d, --directories=ACTION  how to handle directories;
ACTION is 'read', 'recurse', or 'skip'
-D, --devices=ACTION      how to handle devices, FIFOs and sockets; ACTION is 'read' or 'skip'
-r, --recursive          like --directories=recurse
-R, --dereference-recursive
likewise, but follow all symlinks
--include=FILE_PATTERN
search only files that match FILE_PATTERN
--exclude=FILE_PATTERN
skip files and directories matching FILE_PATTERN
--exclude-from=FILE  skip files matching any file pattern from FILE
--exclude-dir=PATTERN directories that match PATTERN will be skipped. -L, --files-without-match print only names of FILEs containing no match -l, --files-with-matches  print only names of FILEs containing matches
-c, --count              print only a count of matching lines per FILE
-T, --initial-tab        make tabs line up (if needed)
-Z, --null                print 0 byte after FILE name
Context control:
-B, --before-context=NUM  print NUM lines of leading context
-A, --after-context=NUM  print NUM lines of trailing context
-C, --context=NUM        print NUM lines of output context
-NUM                      same as --context=NUM
--group-separator=SEP use SEP as a group separator
--no-group-separator  use empty string as a group separator
linux重定向--color[=WHEN],
--colour[=WHEN]      use markers to highlight the matching strings; WHEN is 'always', 'never', or 'auto'
-U, --binary              do not strip CR characters at EOL (MSDOS/Windows) -u, --unix-byte-offsets  report offsets as if CRs were not there
(MSDOS/Windows)
'egrep' means 'grep -E'.  'fgrep' means 'grep -F'.
Direct invocation as either 'egrep' or 'fgrep' is deprecated.
When FILE is -, read standard input.  With no FILE, read . if a command-line -r is given, - otherwise.  If fewer than two FILEs are given, assume -h.
Exit status is 0 if any line is selected, 1 otherwise;
if any error occurs and -q is not given, the exit status is 2.
Report bugs to:
GNU Grep home page:
General help using GNU software:

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