sed实例求解

zsj28

最近在学shell，在练习sed命令时想到一个问题

比如httpd.conf文件

</IfModule>

#
# "/usr/local/apache/cgi-bin" should be changed to whatever your ScriptAliased
# CGI directory exists, if you have that configured.
#
<Directory "/usr/local/apache/cgi-bin">
    AllowOverride None
    Options None
    #Order allow,deny
    #Allow from all
</Directory>

#
# DefaultType: the default MIME type the server will use for a document
# if it cannot otherwise determine one, such as from filename extensions.
# If your server contains mostly text or HTML documents, "text/plain" is
# a good value.  If most of your content is binary, such as applications
# or images, you may want to use "application/octet-stream" instead to
# keep browsers from trying to display binary files as though they are
# text.
#
DefaultType text/plain

下述二种情况的内容需要删除

1) 空行
2) 被注释的行内容, 这里包括#开头的，或者空格,TAB后马上接#的

试了好久，小弟只能通过两次命令才能完成，

$ sed '/^[[:space:]]*$/d' httpd.conf | sed '/^[[:space:]]*#/d' -

怎样才能一次匹配就能解决上面2种情况呢？

beginner-bj

一次正则太难了。你的意思就是不想用管道吧？
sed '/^[[:space:]]*$/d;/^[[:space:]]*#/d' httpd.conf

zsj28

恩，原意是不想用管道，已经是改进了，当然能一次正则当然是最好了

学到东西了

zhaobin81

sed '/^#/d;/\s*#/d' file

ly5066113

try:

sed '/^[[:space:]]*\(#.*\)\{0,1\}$/d' httpd.conf

beginner-bj

学到东西了

yunwuhen

学习了

walkerxk

原帖由 ly5066113 于 2009-12-7 10:19 发表
try:

sed '/^[[:space:]]*\(#.*\)\{0,1\}$/d' httpd.conf

简化下 sed -r /^[[:space:]]*(#.*)?$/d'

rdcwayx

awk '!NF==0 &&! ( $1~/^#/)' httpd.conf

[ 本帖最后由 rdcwayx 于 2009-12-7 12:30 编辑 ]

ybbdnvjfd

发个弱智的
sed -i -e '/^\#/d' -e '/^$/d' -e '/^\    #/d' httpd.conf