CentOS 7 配置文件去註釋和空行與查看配置文件不徹底教程

首先須要安裝測試用軟件vsftpd。下文將演示操做配置文件 /etc/vsftpd/vsftpd.conf 。

#安裝測試軟件vsftpd 過程省略
[root@promote ~]# yum install vsftpd -y
#查看安裝配置文件 顯示不完整
[root@promote ~]# rpm -ql vsftpd | more
/etc/logrotate.d/vsftpd
/etc/pam.d/vsftpd
/etc/vsftpd
/etc/vsftpd/ftpusers
/etc/vsftpd/user_list
/etc/vsftpd/vsftpd.conf
#
內容過長，已刪除一部分
#
/var/ftp
/var/ftp/pub
[root@promote ~]#

去掉#開頭註釋查看文件。推薦使用egrep，本文部份內容將使用egrep。

編輯查看原始配置文件
[root@promote ~]# vim /etc/vsftpd/vsftpd.conf

  1 # Example config file /etc/vsftpd/vsftpd.conf
  2 #
  3 # The default compiled in settings are fairly paranoid. This sample file
  4 # loosens things up a bit, to make the ftp daemon more usable.
  5 # Please see vsftpd.conf.5 for all compiled in defaults.
  6 #
  7 # READ THIS: This example file is NOT an exhaustive list of vsftpd options.
  8 # Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
  9 # capabilities.
 10 #
 11 # Allow anonymous FTP? (Beware - allowed by default if you comment this out).
 12 anonymous_enable=YES
 13 #
 14 # Uncomment this to allow local users to log in.
 15 # When SELinux is enforcing check for SE bool ftp_home_dir
 16 local_enable=YES
 17 #
 18 # Uncomment this to enable any form of FTP write command.
 19 write_enable=YES
 20 #
 21 # Default umask for local users is 077. You may wish to change this to 022,
 22 # if your users expect that (022 is used by most other ftpd's)
 23 local_umask=022
 24 #
 25 # Uncomment this to allow the anonymous FTP user to upload files. This only
 26 # has an effect if the above global write enable is activated. Also, you will
 27 # obviously need to create a directory writable by the FTP user.
 28 # When SELinux is enforcing check for SE bool allow_ftpd_anon_write, allow_ftpd_full_access
 29 #anon_upload_enable=YES
 30 #
 31 # Uncomment this if you want the anonymous FTP user to be able to create
 32 # new directories.
 33 #anon_mkdir_write_enable=YES
 34 #
 35 # Activate directory messages - messages given to remote users when they
 36 # go into a certain directory.
 37 dirmessage_enable=YES
[root@promote ~]# 

-v  表示取反   ^# 表示#開頭行 ^$ 表示空行
[root@promote ~]# grep -v "^#" /etc/vsftpd/vsftpd.conf
anonymous_enable=YES
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_std_format=YES
listen=NO
listen_ipv6=YES

pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
[root@promote ~]#

去#註釋和去空格後效果以下。

#使用egrep 只去掉#註釋
[root@promote ~]# egrep -v '^#' /etc/vsftpd/vsftpd.conf
anonymous_enable=YES
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_std_format=YES
listen=NO
listen_ipv6=YES

pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
#去掉#註釋和空行
[root@promote ~]# egrep -v '^#|^$' /etc/vsftpd/vsftpd.conf
anonymous_enable=YES
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_std_format=YES
listen=NO
listen_ipv6=YES
pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
[root@promote ~]#

查看結果輸出到文件。

#vsftpd.conf可選絕對或相對路徑 
#例如egrep -v '^#|^$' /etc/vsftpd/vsftpd.conf >> /etc/vsftpd/vsftpd.conf

[root@promote ~]# egrep -v '^#|^$' /etc/vsftpd/vsftpd.conf >> vsftpd.conf