GNU Sed

我们以以下文件为例：

$cat file.txt
one two one two one two one two
one two one two one two one two
ONE TWO ONE TWO ONE TWO ONE TWO

删除包含特定字符串的行

$sed '/one/d' file.txt
ONE TWO ONE TWO ONE TWO ONE TWO

替换每行上字符串的第一次出现

$sed 's/one/ONE/' file.txt
ONE two one two one two one two
ONE two one two one two one two
ONE TWO ONE TWO ONE TWO ONE TWO

替换文件中字符串的特定出现

$sed 's/one/ONE/' file.txt
ONE two one two one two one two
ONE two one two one two one two
ONE TWO ONE TWO ONE TWO ONE TWO

$sed 's/one/ONE/3' file.txt
one two one two ONE two one two
one two one two ONE two one two
ONE TWO ONE TWO ONE TWO ONE TWO

$sed 's/one/ONE/g' file.txt
ONE two ONE two ONE two ONE two
ONE two ONE two ONE two ONE two
ONE TWO ONE TWO ONE TWO ONE TWO

$sed 's/one/ONE/3g' file.txt
one two one two ONE two ONE two
one two one two ONE two ONE two
ONE TWO ONE TWO ONE TWO ONE TWO

使所有字母变为大写

$sed 's/./\U&/g' file.txt
ONE TWO ONE TWO ONE TWO ONE TWO
ONE TWO ONE TWO ONE TWO ONE TWO
ONE TWO ONE TWO ONE TWO ONE TWO

使所有字母变为小写

$sed 's/./\L&/g' file.txt
one two one two one two one two
one two one two one two one two
one two one two one two one two

在每行的开头添加单词

$sed 's/^/START /' file.txt
START one two one two one two one two
START one two one two one two one two
START ONE TWO ONE TWO ONE TWO ONE TWO

在每行末尾添加单词

$sed 's/$/END/' file.txt
one two one two one two one two END
one two one two one two one two END
ONE TWO ONE TWO ONE TWO ONE TWO END

删除所有空行

$sed '/^$/d'

删除所有包含空格和制表符的空行

$sed '/^\s*$/d'

列出当前目录中的所有文件，但不包括某些扩展名

$ls -1 | sed '/csv\|txt\|log/d'

从Unix样式（$）转换为DOS样式（\ r）

$sed s/$/"\r"/dosfile.txt > unixfile.txt

从每一行中删除第一个字符

$sed s'/^.//'

从每一行中删除最后一个字符

$sed s'/.$//'

删除所有少于6个字符的行

$sed '/.\{6\}/!d'

用逗号替换换行符

这将循环读取整个文件，然后用逗号替换换行符。

$sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/,/g' file.txt