sh 查找，过滤，搜索，替换和正则表达式

Posted 2021-05-07

#! /bin/bash

# SED (Stream Editor; search and replace)
sed 's/oranges/bananas/g' mysampledata.txt # s/ = mode search; /g global (not just first)
...
# Find & replace
sed -i 's/OLD/NEW/g' file.txt

# AWK (can execute certain control sequences)
awk '{print $2}' # prints second argument
# while, return, ...
ls files_list | awk '{print "mv "$1" "$1".new"}' | sh

# EGREP / GREP
grep -v needle haystack.file # inverts query

# DIFF
# Difference between two directories (-q omits diff content)
diff -rq dir1/ dir2/

# FIND
find . -name output.log -exec grep "something" {} \; -print
find . -name '*.java' -and -not -path "*generated*" | xargs wc -l # count all lines


# Find all files that are...

#  newer than 3 days...
find . -type f -mtime -3 # -1 less than one day, 1 exact one day, +1 more than one day

#  newer than 2016-08-13
find . -type f -newermt 2016-08-13

# between 2016-08-13 and 2016-08-20
find . -type f -newermt 2016-08-13 \! -newermt 2016-08-20

# -type d (directory)
# -empty
# -delete
# -exec rm {} \;

# XARGS - construct argument list(s) and execute utility
find . -type file -print | xargs rm # uses SPACE, TAB, SEMICOLON for delimiter;
# print0 prints without newline
-maxdepth 1 # no subdirs
-size +10000c # size (bytes)