21.打印等腰三角形

[root@rocky8 bin]# vim for_triangle.sh
#!/bin/bash
#
#**********************************************************************************************
#Author:        Raymond
#QQ:            88563128
#Date:          2021-10-10
#FileName:      for_triangle.sh
#URL:           raymond.blog.csdn.net
#Description:   The test script
#Copyright (C): 2021 All rights reserved
#*********************************************************************************************
read -p "请输入三角形的行数:" line
for ((i=1;i<=line;i++));dofor ((k=0;k<=line-i;k++));doecho -e ' \c'donefor ((j=1;j<=2*i-1;j++));doecho -e '*\c'doneecho
done[root@rocky8 bin]# bash for_triangle.sh 
请输入三角形的行数:10****************************************************************************************************

22.判断/var/目录下所有文件的类型

[root@rocky8 bin]# vim for_var.sh
#!/bin/bash
#
#**********************************************************************************************
#Author:        Raymond
#QQ:            88563128
#Date:          2021-10-10
#FileName:      for_var.sh
#URL:           raymond.blog.csdn.net
#Description:   The test script
#Copyright (C): 2021 All rights reserved
#**********************************************************************************************
read -p "Please input directory: " DIR
for FILE in `ls $DIR` ;doTY=`file $DIR/$FILE | egrep -o "link|text|block|directory"`case $TY intext)echo "file $DIR/$FILE is file";;link)echo "file $DIR/$FILE is Link";;block)echo "file $DIR/$FILE is Block";;directory)echo "file $DIR/$FILE is Directory";;*)echo "file $DIR/$FILE is Others"esac;
done[root@rocky8 bin]# bash for_var.sh 
Please input directory: /var/
file /var//account is Directory
file /var//adm is Directory
file /var//cache is Directory
file /var//crash is Directory
file /var//db is Directory
file /var//empty is Directory
file /var//ftp is Directory
file /var//games is Directory
file /var//gopher is Directory
file /var//kerberos is Directory
file /var//lib is Directory
file /var//local is Directory
file /var//lock is Link
file /var//log is Directory
file /var//mail is Link
file /var//nis is Directory
file /var//opt is Directory
file /var//preserve is Directory
file /var//run is Link
file /var//spool is Directory
file /var//tmp is Directory
file /var//yp is Directory