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以 Redhat6.0 為測試環境
事實上在solaris下的sed命令要比linux強，但因為沒有測試
環境，我這里只給在linux下經過測試的用法。
目錄：
★ 命令行參數簡介
★ 首先假設我們有這樣一個文本文件 sedtest.txt
★ 輸出指定范圍的行 p
★ 在每一行前面增加一個制表符(^I)
★ 在每一行后面增加--end
★ 顯示指定模式匹配行的行號 [/pattern/]=
★ 在匹配行后面增加文本 [/pattern/]a\ 或者 [address]a\
★ 刪除匹配行 [/pattern/]d 或者 [address1][,address2]d
★ 替換匹配行 [/pattern/]c\ 或者 [address1][,address2]c\
★ 在匹配行前面插入文本 [/pattern/]i\ 或者 [address]i\
★ 替換匹配串(注意不再是匹配行) [addr1][,addr2]s/old/new/g
★ 限定范圍后的模式匹配
★ 指定替換每一行中匹配的第幾次出現
★ &代表最后匹配
★ 利用sed修改PATH環境變量
★ 測試并提高sed命令運行效率
★ 指定輸出文件 [address1][,address2]w outputfile
★ 指定輸入文件 [address]r inputfile
★ 替換相應字符 [address1][,address2]y/old/new/
★ !號的使用
★ \c正則表達式c 的使用
★ sed命令中正則表達式的復雜性
★ 轉換man手冊成普通文本格式(新)
★ sed的man手冊(用的就是上面的方法)
★ 命令行參數簡介
sed
-e script 指定sed編輯命令
-f scriptfile 指定的文件中是sed編輯命令
-n 寂靜模式，抑制來自sed命令執行過程中的冗余輸出信息，比如只
顯示那些被改變的行。
不明白？不要緊，把這些骯臟丟到一邊，跟我往下走，不過下面的介紹里
不包括正則表達式的解釋，如果你不明白，可能有點麻煩。
★ 首先假設我們有這樣一個文本文件 sedtest.txt
cat > sedtest.txt
Sed is a stream editor
----------------------
A stream editor is used to perform basic text transformations on an input stream
--------------------------------------------------------------------------------
While in some ways similar to an editor which permits scripted edits (such as ed
)
,
--------------------------------------------------------------------------------
-
-
sed works by making only one pass over the input(s), and is consequently more
-----------------------------------------------------------------------------
efficient. But it is sed's ability to filter text in a pipeline which particular
l
y
--------------------------------------------------------------------------------
-
★ 輸出指定范圍的行 p other types of editors.
sed -e "1,4p" -n sedtest.txt
sed -e "/from/p" -n sedtest.txt
sed -e "1,/from/p" -n sedtest.txt
★ 在每一行前面增加一個制表符(^I)
sed "s/^/^I/g" sedtest.txt
注意^I的輸入方法是ctrl-v ctrl-i
單個^表示行首
★ 在每一行后面增加--end
sed "s/$/--end/g" sedtest.txt
單個$表示行尾
★ 顯示指定模式匹配行的行號 [/pattern/]=
sed -e '/is/=' sedtest.txt
1
Sed is a stream editor
----------------------
3
A stream editor is used to perform basic text transformations on an input stream
--------------------------------------------------------------------------------
While in some ways similar to an editor which permits scripted edits (such as ed
)
,
--------------------------------------------------------------------------------
-
-
7
sed works by making only one pass over the input(s), and is consequently more
-----------------------------------------------------------------------------
9
efficient. But it is sed's ability to filter text in a pipeline which particular
l
y
--------------------------------------------------------------------------------
-
-
意思是分析sedtest.txt，顯示那些包含is串的匹配行的行號，注意11行中出現了is字符串
這個輸出是面向stdout的，如果不做重定向處理，則不影響原來的sedtest.txt
★ 在匹配行后面增加文本 [/pattern/]a\ 或者 [address]a\
^D
sed -f sedadd.script sedtest.txt
Sed is a stream editor
A stream editor is used to perform basic text transformations on an input stream
While in some ways similar to an editor which permits scripted edits (such as ed
)
,
--------------------------------------------------------------------------------
-
-
sed works by making only one pass over the input(s), and is consequently more
-----------------------------------------------------------------------------
efficient. But it is sed's ability to filter text in a pipeline which particular
l
y
--------------------------------------------------------------------------------
-
-
[scz@ /home/scz/src]> sed -e "a\\
+++++++++
---------------------------------------------
找到包含from字符串的行，在該行的下一行增加+++++++++。
這個輸出是面向stdout的，如果不做重定向處理，則不影響原來的sedtest.txt
很多人想在命令行上直接完成這個操作而不是多一個sedadd.script，不幸的是，這需要用?nbsp;
?nbsp;
續行符\，
[scz@ /home/scz/src]> sed -e "/from/a\\
＞ +++++++++" sedtest.txt
[scz@ /home/scz/src]> sed -e "a\\
＞ +++++++++" sedtest.txt
上面這條命令將在所有行后增加一個新行+++++++++
[scz@ /home/scz/src]> sed -e "1 a\\
＞ +++++++++" sedtest.txt
把下面這兩行copy/paste到一個shell命令行上，效果一樣
+++++++++" sedtest.txt
[address]a\ 只接受一個地址指定
對于a命令，不支持單引號，只能用雙引號，而對于d命令等其他命令，同時
★ 刪除匹配行 [/pattern/]d 或者 [address1][,address2]d
sed -e '/---------------------------------------------/d' sedtest.txt
Sed is a stream editor
A stream editor is used to perform basic text transformations on an input stream
While in some ways similar to an editor which permits scripted edits (such as ed
)
,
sed works by making only one pass over the input(s), and is consequently more
efficient. But it is sed's ability to filter text in a pipeline which particular
l
y
sed -e '6,10d' sedtest.txt
刪除6-10行的內容，包括6和10
sed -e "2d" sedtest.txt
刪除第2行的內容
sed "1,/^$/d" sedtest.txt
刪除從第一行到第一個空行之間的所有內容
注意這個命令很容易帶來意外的結果，當sedtest.txt中從第一行開始并沒有空行，則sed刪
?nbsp;
?nbsp;
sed "1,/from/d" sedtest.txt
刪除從第一行到第一個包含from字符串的行之間的所有內容，包括第一個包含
from字符串的行。
★ 替換匹配行 [/pattern/]c\ 或者 [address1][,address2]c\
sed -e "/is/c\\
**********" sedtest.txt
尋找所有包含is字符串的匹配行，替換成**********
**********
----------------------
**********
--------------------------------------------------------------------------------
While in some ways similar to an editor which permits scripted edits (such as ed
)
,
--------------------------------------------------------------------------------
-
-
**********
-----------------------------------------------------------------------------
**********
--------------------------------------------------------------------------------
-
sed -e "1,11c\\
**********" sedtest.txt----------------------
在1-12行內搜索所有from字符串，分別替換成****字符串
★ 限定范圍后的模式匹配
sed "/But/s/is/are/g" sedtest.txt
對那些包含But字符串的行，把is替換成are
sed "/is/s/t/T/" sedtest.txt
對那些包含is字符串的行，把每行第一個出現的t替換成T
sed "/While/,/from/p" sedtest.txt -n
輸出在這兩個模式匹配行之間的所有內容
★ 指定替換每一行中匹配的第幾次出現
sed "s/is/are/5" sedtest.txt
把每行的is字符串的第5次出現替換成are
★ &代表最后匹配
sed "s/^$/(&)/" sedtest.txt
給所有空行增加一對()
sed "s/is/(&)/g" sedtest.txt
給所有is字符串外增加()
sed "s/.*/(&)/" sedtest.txt
給所有行增加一對()
sed "/is/s/.*/(&)/" sedtest.txt
給所有包含is字符串的行增加一對()
★ 利用sed修改PATH環境變量
先查看PATH環境變量
[scz@ /home/scz/src]> echo $PATH
/usr/bin:/usr/bin:/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/X11R6/bin:.
去掉尾部的{ :/usr/X11R6/bin:. }
[scz@ /home/scz/src]> echo $PATH | sed "s/^\(.*\):\/usr[/]X11R6\/bin:[.]$/\1/"
/usr/bin:/usr/bin:/bin:/usr/local/bin:/sbin:/usr/sbin
去掉中間的{ :/bin: }
[scz@ /home/scz/src]> echo $PATH | sed "s/^\(.*\):\/bin:\(.*\)$/\1\2/"
/usr/bin:/usr/bin/usr/local/bin:/sbin:/usr/sbin:/usr/X11R6/bin:.
[/]表示/失去特殊意義
\/同樣表示/失去意義
\1表示子匹配的第一次出現
\2表示子匹配的第二次出現
\(.*\)表示子匹配
去掉尾部的:，然后增加新的路徑
PATH=`echo $PATH | sed 's/\(.*\):$/\1/'`:$HOME/src
注意反引號`和單引號'的區別。
★ 測試并提高sed命令運行效率
time sed -n "1,12p" webkeeper.db > /dev/null
time sed 12q webkeeper.db > /dev/null
可以看出后者比前者效率高。
[address]q 當碰上指定行時退出sed執行
★ 指定輸出文件 [address1][,address2]w outputfile
sed "1,10w sed.out" sedtest.txt -n
將sedtest.txt中1-10行的內容寫到sed.out文件中。
★ 指定輸入文件 [address]r inputfile
sed "1r sedappend.txt" sedtest.txt
將sedappend.txt中的內容附加到sedtest.txt文件的第一行之后
★ 替換相應字符 [address1][,address2]y/old/new/
sed "y/abcdef/ABCDEF/" sedtest.txt
將sedtest.txt中所有的abcdef小寫字母替換成ABCDEF大寫字母。
★ !號的使用
sed -e '3,7!d' sedtest.txt
刪除3-7行之外的所有行
sed -e '1,/from/!d' sedtest.txt
找到包含from字符串的行，刪除其后的所有行
★ \c正則表達式c 的使用
sed -e "\:from:d" sedtest.txt
等價于 sed -e "/from/d" sedtest.txt
★ sed命令中正則表達式的復雜性
cat > sedtest.txt
^\/[}]{.*}[\(]$\)
^D
如何才能把該行替換成
\(]$\)\/[}]{.*}^[
★ 轉換man手冊成普通文本格式(新)
man sed | col -b > sed.txt
sed -e "s/^H//g" -e "/^$/d" -e "s/^^I/ /g" -e "s/^I/ /g" sed.txt > sedman
.
txt
刪除所有退格鍵、空行，把行首的制表符替換成8個空格，其余制表符替換成一個空格。
★ sed的man手冊(用的就是上面的方法)
NAME
sed - a Stream EDitor
SYNOPSIS
sed [-n] [-V] [--quiet] [--silent] [--version] [--help]
[-e script] [--expression=script]
[-f script-file] [--file=script-file]
[script-if-no-other-script]
[file...]
DESCRIPTION
Sed is a stream editor. A stream editor is used to per-
form basic text transformations on an input stream (a file
or input from a pipeline). While in some ways similar to
an editor which permits scripted edits (such as ed), sed
works by making only one pass over the input(s), and is
consequently more efficient. But it is sed's ability to
filter text in a pipeline which particularly distinguishes
it from other types of editors.
OPTIONS
Sed may be invoked with the following command-line
options:
-V
--version
Print out the version of sed that is being run and
a copyright notice, then exit.
-h
--help Print a usage message briefly summarizing these
command-line options and the bug-reporting address,
then exit.
-n
--quiet
--silent
By default, sed will print out the pattern space at
the end of each cycle through the script. These
options disable this automatic printing, and sed
will only produce output when explicitly told to
via the p command.
-e script
--expression=script
Add the commands in script to the set of commands
to be run while processing the input.
-f script-file
--file=script-file
Add the commands contained in the file script-file
to the set of commands to be run while processing
the input.
If no -e,-f,--expression, or --file options are given on
the command-line, then the first non-option argument on
the command line is taken to be the script to be executed.
If any command-line parameters remain after processing the
above, these parameters are interpreted as the names of
input files to be processed. A file name of - refers to
the standard input stream. The standard input will pro-
cessed if no file names are specified.
Command Synopsis
This is just a brief synopsis of sed commands to serve as
a reminder to those who already know sed; other documenta-
tion (such as the texinfo document) must be consulted for
fuller descriptions.
Zero-address ``commands''
: label
Label for b and t commands.
#comment
The comment extends until the next newline (or the
end of a -e script fragment).
} The closing bracket of a { } block.
Zero- or One- address commands
= Print the current line number.
a \
text Append text, which has each embedded newline pre-
ceeded by a backslash.
i \
text Insert text, which has each embedded newline pre-
ceeded by a backslash.
q Immediately quit the sed script without processing
any more input, except that if auto-print is not
diabled the current pattern space will be printed.
r filename
Append text read from filename.
Commands which accept address ranges
{ Begin a block of commands (end with a }).
b label
Branch to label; if label is omitted, branch to end
of script.
t label
If a s/// has done a successful substitution since
the last input line was read and since the last t
command, then branch to label; if label is omitted,
branch to end of script.
c \
text Replace the selected lines with text, which has
each embedded newline preceeded by a backslash.
d Delete pattern space. Start next cycle.
D Delete up to the first embedded newline in the pat-
tern space. Start next cycle, but skip reading
from the input if there is still data in the pat-
tern space.
h H Copy/append pattern space to hold space.
g G Copy/append hold space to pattern space.
x Exchange the contents of the hold and pattern
spaces.
l List out the current line in a ``visually unambigu-
ous'' form.
n N Read/append the next line of input into the pattern
space.
p Print the current pattern space.
P Print up to the first embedded newline of the cur-
rent pattern space.
s/regexp/replacement/
Attempt to match regexp against the pattern space.
If successful, replace that portion matched with
replacement. The replacement may contain the spe-
cial character & to refer to that portion of the
pattern space which matched, and the special
escapes \1 through \9 to refer to the corresponding
matching sub-expressions in the regexp.
w filename Write the current pattern space to file-
name.
y/source/dest/
Transliterate the characters in the pattern space
which appear in source to the corresponding charac-
ter in dest.
Addresses
Sed commands can be given with no addresses, in which case
the command will be executed for all input lines; with one
address, in which case the command will only be executed
for input lines which match that address; or with two
addresses, in which case the command will be executed for
all input lines which match the inclusive range of lines
starting from the first address and continuing to the sec-
ond address. Three things to note about address ranges:
the syntax is addr1,addr2 (i.e., the addresses are sepa-
rated by a comma); the line which addr1 matched will
always be accepted, even if addr2 selects an earlier line;
and if addr2 is a regexp, it will not be tested against
the line that addr1 matched.
After the address (or address-range), and before the com-
mand, a ! may be inserted, which specifies that the com-
mand shall only be executed if the address (or address-
range) does not match.
The following address types are supported:
number Match only the specified line number.
first~step
Match every step'th line starting with line first.
For example, ``sed -n 1~2p'' will print all the
odd-numbered lines in the input stream, and the
address 2~5 will match every fifth line, starting
with the second. (This is a GNU extension.)
$ Match the last line.
/regexp/
Match lines matching the regular expression regexp.
\cregexpc
Match lines matching the regular expression regexp.
The c may be any character.
Regular expressions
POSIX.2 BREs should be supported, but they aren't com-
pletely yet. The \n sequence in a regular expression
matches the newline character. There are also some GNU
extensions. [XXX FIXME: more needs to be said. At the
very least, a reference to another document which
describes what is supported should be given.]
Miscellaneous notes
This version of sed supports a \<newline> sequence in all
regular expressions, the replacement part of a substitute
(s) command, and in the source and dest parts of a
transliterate (y) command. The \ is stripped, and the
newline is kept.
SEE ALSO
awk(1), ed(1), expr(1), emacs(1), perl(1), tr(1), vi(1),
regex(5) [well, one ought to be written... XXX], sed.info,
any of various books on sed, the sed FAQ
(http://www.wollery.demon.co.uk/sedtut10.txt,
http://www.ptug.org/sed/sedfaq.htm).
BUGS
E-mail bug reports to bug-gnu-utils@gnu.org. Be sure to
include the word ``sed'' somewhere in the ``Subject:''
field.  轉自： http://www.1717du.com/web/Article/os/unix/200505/6033.html
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