考试复习"/>
RHE考试复习
下午考试,现在一边复习一边写,没有详细介绍,适合熟悉linux操作的同类菜鸟。
1. history
history n
!!
!$
!c
!num
!?abc
!-n
2.ls -a
ls -l
ls -R
ls- ld
3. rm -i
rm -r
rm -f
4.chown
u,g,o
+,-
r,w,x
-R #Recursive
-v #verbose
--reference #chmod --reference file1 file2
chmod
chgrp user1 file;chgrp user2 file #chgrp user1:user2 file
5.echo
$(command)
${variable} = $VARIABLE
6.PS1 PS1="\u@\h:\w<\!>\$"
\u
\h
\w
\!
\$
7.> #STDOUT
2> #STDERR
&> #ALL OUTPUT
2>&1 #redirect STERR to STDOUT
() #combine STDOUTs
> direct
>> append
8.less
mail #mail -s ""some message" username@example <<END
lpr
9. tr 'A-Z' 'a-z' #uppercase to lowercase
#tr 'A-Z' 'a-z' < file
10.for n in{1,2};do
...
done
11.seq NUM #print zero to NUM
seq NUM TO_NUM #print NUM to TO_NUM
12. cat
-A
-s
-b
13. less
b
k
space
ENTER
g
G
/text #search
n
N
q #exit
v #open file in (vi by default)
14.head file #default 10 lines
head -n NUM file
tail file
tail -n NUM file
tail -f file #continute to show update
15.grep
-i
-n
-v
-Ax
-Bx
-r
--color
16. wc #text stats -l -w -c -m
sort
diff
aspell
17.cut
-d
-f
-c
18. sort
sort file | uniq #means sort -u
-d
-c
-sn -fn
19.aspell
aspell check file
aspell list < file
20.look WORD # a quick spelling dictionnary look-up
21.tr #translate
sed #stream editor
sed 's/WORD1/WORD2/g' file
# sed '%s/WORD1/WORD2/g' file
sed '1,50s/WORD1/WORD2/g' file
sed '/digby/,/duncan/s/WORD1/WORD2/g' file
sed -e ' ' -e ' ' file
sed -f SAVEFILE file
22. ^ $ [xyz] [^xyz]
# grep '^rain' file
#grep 'false$' file
2点半倒计时,387页只看到了187,不笔记了!!
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RHE考试复习
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