#!/bin/bash

######################################## File Description ########################################
# Creation time:2020-05-30
# Project:02
# Task: 05
# Execute example:bash record-shell-x-x.sh
# Detailed description:
# About:http://linux.book.51xueweb.cn
##################################################################################################

#***************record shell start***************
# Look the list of directories

ls /
ls -al /
ls -lt /
# View the files or directories in the / directory
ls -lh /

# Short text viewing
cat /etc/profile

#View the profile content in the /etc/directory and number non-blank lines, starting at 1
cat -b /etc/profile

# View the profile content under /etc/
cat -n /etc/profile
# Long text content viewing
more -dc /var/log/messages
more -c -10 /var/log/messages
more -p -5 /var/log/messages

# Show /var/log/message 
more -s /var/log/messages
more +20 /var/log/messages

# Flexible viewing of long text content
less /var/log/messages
less /var/log/messages
less /var/log/messages

# Text header content view
head /etc/passwd
head -v -n 2 /etc/passwd

# View the end of the text
tail /etc/passwd
tail -v -n 2 /etc/passwd

# Text content retrieval
grep -n user /etc/passwd
grep '^\user' /etc/passwd
grep -c user /etc/passwd
cat >> sort.txt << EOF
A:10:6.1
C:30:4.3
D:40:3.4
B:20:5.2
F:60:1.6
F:60:1.6
E:50:2.5
EOF

# Text content is sorted
cat sort.txt
sort sort.txt
sort -n -k 3 -t: sort.txt
cat >> uniq.txt << EOF
A
A
C
C
C
B
B
D
EOF


# Text content processing
cat uniq.txt
uniq uniq.txt
uniq -c uniq.txt
sort uniq.txt | uniq
cat >> sed.txt <<EOF
Linux - Sysadmin.
Database - Oracle，MyDQL etc.
Cool - Websites.
Storage - NetAPP，ENC etc.
Security - Firewall，Network，Online etc.
EOF


# Text processing
cat sed.txt
sed '2a *Hello World*' sed.txt
sed '$a *The End*' sed.txt
sed '2,4c *Hello World*' sed.txt
sed '1i *The Begin*' sed.txt
sed 's/Linux - Sysadmin/*Hello World*/g' sed.txt
sed '1,3d' sed.txt
sed '2,4p' sed.txt



#***************record shell end***************