[英]How to match & then replace multiple lines in shell script
Hi I have this text file. 嗨,我有这个文本文件。
Physical interface: ge-0/0/3, Enabled, Physical link is Up
Interface index: 132, SNMP ifIndex: 504
Description: # SURVEILLANCE CAMERA #
Link-level type: Flexible-Ethernet, Media type: Copper, MTU: 9000,
LAN-PHY mode, Link-mode: Full-duplex, Speed: 1000mbps, BPDU Error: None,
.....few more lines
Physical interface: ge-0/1/0, Enabled, Physical link is Down
Interface index: 133, SNMP ifIndex: 505
Link-level type: Ethernet, Media type: Fiber, MTU: 1514, LAN-PHY mode,
Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None,
.....few more lines
Physical interface: ge-0/1/3, Enabled, Physical link is Up
Interface index: 136, SNMP ifIndex: 508
Description: # TO CSS_I-TN-CHNN-ENB-I099 #
Link-level type: Flexible-Ethernet, Media type: Fiber, MTU: 8000,
LAN-PHY mode, Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None,
... few more lines
and so on....
Now If Physical link is Up & value of MTU is 9000 then only I need to replace both the corresponding lines as. 现在,如果“物理链接”已打开且MTU的值为9000,则只需要替换两条相应的行即可。
<Pass>Physical interface: ge-0/0/3, Enabled, Physical link is Up
&
<Pass>Link-level type: Flexible-Ethernet, Media type: Fiber, MTU: 9000,
In every other situation it will be <Fail>
in place of <Pass>
. 在其他所有情况下,它将用
<Fail>
代替<Pass>
。 these values lie in different line that why I am not getting any idea of using sed or anything else..please help... here is the expected output.. 这些值位于不同的行中,这就是为什么我不了解使用sed或其他任何东西的原因..请帮助...这是预期的输出。
<Pass>Physical interface: ge-0/0/3, Enabled, Physical link is Up
Interface index: 132, SNMP ifIndex: 504
Description: # SURVEILLANCE CAMERA #
<Pass>Link-level type: Flexible-Ethernet, Media type: Copper, MTU: 9000,
LAN-PHY mode, Link-mode: Full-duplex, Speed: 1000mbps, BPDU Error: None,
.....few more lines
<Fail>Physical interface: ge-0/1/0, Enabled, Physical link is Down
Interface index: 133, SNMP ifIndex: 505
<Fail>Link-level type: Ethernet, Media type: Fiber, MTU: 1514, LAN-PHY mode,
Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None,
.....few more lines
<Fail>Physical interface: ge-0/1/3, Enabled, Physical link is Up
Interface index: 136, SNMP ifIndex: 508
Description: # TO CSS_I-TN-CHNN-ENB-I099 #
<Fail>Link-level type: Flexible-Ethernet, Media type: Fiber, MTU: 8000,
LAN-PHY mode, Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None,
... few more lines
and so on....
With sed: 与sed:
sed '/Physical link is/ { :a /MTU:/! { N; ba; }; /Physical link is Up.*MTU: 9000/ { s/\(.*\n\)\s*/<Pass>\1<Pass>/; b; }; s/\(.*\n\)\s*/<Fail>\1<Fail>/; }' filename
That is: 那是:
/Physical link is/ { # Block start found
:a
/MTU:/! { # fetch lines until we find the MTU
N
ba
}
/Physical link is Up.*MTU: 9000/ { # If link is up and MTU 9000
s/\(.*\n\)[[:space:]]*/<Pass>\1<Pass>/ # insert Pass markers
b
# we're done.
}
s/\(.*\n\)[[:space:]]*/<Fail>\1<Fail>/ # otherwise insert Fail markers
}
Note that with BSD sed, this cannot be used as a one-liner because of the b
instructions. 请注意,对于BSD sed,由于使用
b
指令,因此不能用作单线。 In that case, put the expanded (without comments, for BSD sed is easily confused) code in a file, say foo.sed
, and use sed -f foo.sed filename
. 在这种情况下,请将扩展的代码(不带注释,因为BSD sed很容易混淆)放在文件中,例如
foo.sed
,然后使用sed -f foo.sed filename
。 I've already replaced the other GNU-ism ( \\s
) with its POSIX equivalent ( [[:space:]]
) there. 我已经用它的POSIX等效项(
[[:space:]]
)替换了其他GNU-ism( \\s
)。
To keep the whitespaces at the beginning of the MTU line, remove the \\s
or [[:space:]]
. 要将空格保留在MTU行的开头,请删除
\\s
或[[:space:]]
。 To place the whitespaces before the result marker, put the \\s
or [[:space:]]
inside the capturing group (ie, \\(.*\\n\\s*\\)
). 要将空格放在结果标记之前,请将
\\s
或[[:space:]]
放在捕获组内(即\\(.*\\n\\s*\\)
)。
Also note: This assumes that every interface description has an MTU field. 另请注意:这假设每个接口描述都有一个MTU字段。
Alternatively, you might try this awk script: 或者,您可以尝试以下awk脚本:
awk -v RS='Physical interface:' -F '\n' -v OFS='\n' '{ result = "<Fail>" } /Physical link is Up/ && /MTU: 9000/ { result = "<Pass>" } NR != 1 { for(i = 1; i <= NF; ++i) { if(index($i, "MTU:")) { sub(/^ */, result, $i) } } print result RS $0 }' filename
This splits the file into records at Physical interface:
and the records into fields at newlines. 这会将文件拆分为“
Physical interface:
的记录Physical interface:
并将记录拆分为换行符的字段。 Then: 然后:
{ result = "<Fail>" } # result is Fail
/Physical link is Up/ && /MTU: 9000/ { # unless link is up and MTU 9000
result = "<Pass>"
}
NR != 1 { # the first record is the empty string
# before the first actual record, so
# we remove it.
for(i = 1; i <= NF; ++i) { # wade through the fields (lines)
if(index($i, "MTU:")) { # find the MTU line
sub(/^ */, result, $i) # put the marker there. To keep the
# whitespace, use $i = result $i
# instead, or sub(/^ */, "&" result, $i)
# to keep the spaces before the marker.
}
}
print result RS $0 # once done, print the whole shebang.
# We have to reinsert the record
# separator because it was removed
# by the splitting.
}
Note that a multi-character RS
is not strictly POSIX-conforming. 注意,多字符
RS
并非严格符合POSIX。 The most common awks (gawk and mawk) support it, though. 不过,最常见的awks(gawk和mawk)都支持它。 Notably, BSD awk does not.
值得注意的是,BSD awk没有。
Try the following awk
command, which should be POSIX-compliant and preserves leading whitespace: 尝试使用以下
awk
命令,该命令应符合POSIX并保留前导空白:
awk '
/ Physical link is / { ++count }
/, MTU: / {
tag = (blockLines[1] ~ /Up$/ && $0 ~ /, MTU: 9000,/ ? "<Pass>" : "<Fail>")
sub(/^/, "&" tag, blockLines[1])
sub(/^ +/, "&" tag)
for (i = 1; i < count; ++i) print blockLines[i]
count = 0
}
count > 0 { blockLines[count++] = $0; next }
{ print }
' file
The basic idea is: 基本思想是:
Annotated version of the Awk script only: 仅带注释的Awk脚本版本 :
/ Physical link is / { ++count } # Start of block
/, MTU: / { # End of block - fail/pass can now be determined
# Determine whether to apply a fail or a pass tag based on the
# first and last line in the block.
tag = (blockLines[1] ~ /Up$/ && $0 ~ /, MTU: 9000,/ ? "<Pass>" : "<Fail>")
# Prepend tag to 1st line in block
sub(/^/, "&" tag, blockLines[1])
# Prepend tag to last line in block, preserving leading whitespace.
sub(/^ +/, "&" tag)
# Print all lines in block (except for last one).
for (i = 1; i < count; ++i) print blockLines[i]
# Reset block line counter.
count = 0
}
# Inside block: collect lines, do not print yet.
count > 0 { blockLines[count++] = $0; next }
# Print last line in block and lines outside of blocks.
{ print }
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