Linux Basic Part12 Less and More , Head and Tail, WC ,DU
20220208 181612
cat -- read file
less --read file from top to bottum and buttom to top
--search pattern/key -- quit -q
more -- read file from top to buttom
--search pattern/key
--quit -q , reach end of file
less /etc/passwd
more /etc/passwd
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kick start
jump start
unattended installation
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head --display first lines
-1st 10 lines by default
tail --display last lines
-by default last 10 lines
wc -- word count
-count line word char/byte
head /etc/passwd --1st 10 lines
head -5 /etc/passwd -- 1st 5 lines
head -15 /etc/passwd --1st 15 lines
tail /etc/passwd --last 10 lines
tail -5 /etc/passwd --last 5 lines
tail -15 /etc/passwd --last 15 lines
tail -l /etc/passwd --last line
wc /etc/passwd
47 103 2585 --47 lines , 103 word, 2585 char/byte
wc -l /etc/passwd -- -l no of lines
wc -w /etc/passwd -- -w no of word
wc -c /etc/passwd -- -c no of char
du -- size on the disk
du -h --human readable MB,GB,KB....
du -k --kilobytes
du -b --bytes
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