Ubuntu系统：自带Perl降版本&Perl5.16安装

Ubuntu18.4 安装perl5.16

1、切换下载源：
    1）、搜索softwares&&update，然后切换源为main server，默认是chain server
    2)、执行：sudo apt-get update && sudo apt-get upgrade 需要20分钟~40分钟
    3）、sudo apt install gcc
    4）、sudo apt install build-essential

sudo wget https://www.cpan.org/src/5.0/perl-5.16.0.tar.gz

2、whereis perl 

3、sudo rm -rf allFolder
    sudo rm -rf /usr/bin/perl5.26-x86_64-linux-gnu && sudo rm -rf /usr/bin/perl && sudo rm -rf /usr/lib/x86_64-linux-gnu/perl && sudo rm -rf /etc/perl/ && sudo rm -rf /usr/share/perl && sudo rm -rf /usr/share/man/man1/perl.1.gz

4、sudo tar zxvf perl-5.16.0.tar.gz

5、sudo ./Configure --help
    Usage: Configure [-dehrsEKOSV] [-f config.sh] [-D symbol] [-D symbol=value]
                 [-U symbol] [-U symbol=] [-A command:symbol...]
  -d : use defaults for all answers.
  -e : go on without questioning past the production of config.sh.
  -f : specify an alternate default configuration file.
  -h : print this help message and exit (with an error status).
  -r : reuse C symbols value if possible (skips costly nm extraction).
  -s : silent mode, only echoes questions and essential information.
  -D : define symbol to have some value:
         -D symbol         symbol gets the value 'define'
         -D symbol=value   symbol gets the value 'value'
       common used examples (see INSTALL for more info):
         -Duse64bitint            use 64bit integers
         -Duse64bitall            use 64bit integers and pointers
         -Dusethreads             use thread support
         -Dinc_version_list=none  do not include older perl trees in @INC
         -DEBUGGING=none          DEBUGGING options
         -Dcc=gcc                 choose your compiler
         -Dprefix=/opt/perl5      choose your destination
  -E : stop at the end of questions, after having produced config.sh.
  -K : do not use unless you know what you are doing.
  -O : let -D and -U override definitions from loaded configuration file.
  -S : perform variable substitutions on all .SH files (can mix with -f)
  -U : undefine symbol:
         -U symbol    symbol gets the value 'undef'
         -U symbol=   symbol gets completely empty
       e.g.:  -Uversiononly
  -A : manipulate symbol after the platform specific hints have been applied:
         -A append:symbol=value   append value to symbol
         -A symbol=value          like append:, but with a separating space
         -A define:symbol=value   define symbol to have value
         -A clear:symbol          define symbol to be ''
         -A define:symbol         define symbol to be 'define'
         -A eval:symbol=value     define symbol to be eval of value
         -A prepend:symbol=value  prepend value to symbol
         -A undef:symbol          define symbol to be 'undef'
         -A undef:symbol=         define symbol to be ''
       e.g.:  -A prepend:libswanted='cl pthread '
              -A ccflags=-DSOME_MACRO
  -V : print version number and exit (with a zero status).
  
  
 6、sudo apt update
 7、sudo apt install build-essential	【如果安装失败，依次执行：】
	7.1、sudo apt-get -f -y install
	7.2、sudo apt-get update
	7.3、sudo apt-get upgrade
	7.4、sudo apt install gcc
	7.5、gcc --version
			gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
			Copyright (C) 2017 Free Software Foundation, Inc.
			This is free software; see the source for copying conditions.  There is NO
			warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
8、sudo apt install make
9、sudo ./Configure -des -Dprefix=/usr/local/perl -Dusethreads -Uversiononly
10、sudo make
    (if error ,find error files and lines,use /*  */, delete it.)
11、sudo make install
12、cd /usr/bin/
13、sudo mv perl perl.old
14、sudo ln -s /usr/local/perl/bin/perl /usr/bin/perl
15、perl --version