# delete the last 2 lines of a file sed 'N;$!P;$!D;$d' The above will delete the last 2 line of a file. I tried analyzing what happens. And I got lost This is what I understood so far from the above. N;Read the complete file into the pattern-space. ...
# delete all lines except duplicate lines (emulates "uniq -d"). sed '$!N; s/^\(.*\)\n\1$/\1/; t; D' # delete the last line of a file sed '$d' # delete the last 2 lines of a file sed 'N;$!P;$!D;$d' # delete the last 10 lines of a file sed -e :a -e ...
sed help - delete last 2 lines. I have been reading through the sed one liners, trying to understand what is happening. # delete the last 2 lines of a file sed 'N;$!P;$!D;$d' The above will delete the last 2 line of a file. I tried analyzing what happens. And I got lost...
称为“模式空间”（pattern space），接着用sed命令处理缓冲区中的内容，处理完成后，把缓冲区的内容送...
sed 's/\(.*\)foo\(.*foo\)/\1bar\2/' # replace the next-to-last case sed 's/\(.*\)foo/\1bar/' # replace only the last case # substitute "foo" with "bar" ONLY for lines which contain "baz" sed '/baz/s/foo/bar/g' ...
# delete only the 2nd line sed '2 d' xxx # delete from line 1 to 4 sed '1,4 d' xxx # delete from 2 to last line sed '2,$ d' xxx # delete only odd number sed '1~2 d' xxx # delete lines matching the pattern "Manager" sed '/Manager/ d' xxx # delete lines starting fr...
delete the first 10 lines of a file sed '1,10d' delete the last line of a file sed '$d' delete the last 2 lines of a file sed 'N;$!P;$!D;$d' delete the last 10 lines of a file sed -e :a -e '$d;N;2,10ba' -e 'P;D' # method 1 sed -n -e :a -e '1,10...
To delete all lines except last, use: sed '$!d' filename To delete all lines except 5th line, use: sed '5!d' filename To delete all lines except lines from 4 to 6, use: sed '4,6!d' filename Delete all empty lines To delete all blank lines, use the sed command in this man...
{ Begin a block of commands (end with a }).c \text Replace the selected lines with text, which has each embedded newline preceded by a backslash.d Delete pattern space. Start next cycle.D If pattern space contains no newline, start a normal new cycle as if the d command was issued...
1、循环的方式first为第一次处理的行,step为步长为多少,如上面的2~5的例子,第一个处理的是第2行,第二个则为第7行。 $ Match the last line. 2、$只会匹配最后一行 /regexp/ Match lines matching the regular expression regexp. 3、使用文本过滤的方式,如果该行中存在匹配,才会执行后面的单命令操作。