为什么awk删除了第一个字符？

时间：2015-11-03 10:41:58

标签： bash awk

我发出了一个奇怪的行为。 我尝试创建一个脚本，但awk正在删除我的第一个字符，我不知道为什么。 当然这段代码现在没用，但我不能继续这个奇怪的问题...... 

#!/bin/bash

for entry in TF5*; do
        if [[ ! $entry =~ ".desc" ]] ; then

                awk '
                BEGIN {print "BEGIN" }
                { print $0 " "}
                END { print " - DONE -" }
                ' < $entry


        fi
done

输出：

BEGIN


 ort      Name               Status       Vlan       Duplex  Speed Type
 i1/0/2   v5.7-TF5-XXXXXXXXX connected    10         a-full a-1000 10/100/1000BaseTX
 i1/0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX
 i1/0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
 i1/0/5   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
 i1/0/6   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX
 i1/0/7   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX
 e1/0/1   *** MOG2SWXXXXXXXX connected    trunk        full    10G 10GBase-SR
 i2/0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX
 i2/0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
 i2/0/5   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
 i2/0/6   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX
 i2/0/7   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX
 e2/0/1   *** MOG2SWXXXXXXXX connected    trunk        full    10G 10GBase-SR
 o1       *** SW1+2-XXXXXXXX connected    trunk      a-full    10G
 o4       *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000
 o6       *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000
 o7       *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000
 - DONE -

例如，如果我按{ print $0 " "}更改{ print $0 " "} 新输出是：

BEGIN


   t      Name               Status       Vlan       Duplex  Speed Type
   /0/2   v5.7-TF5-FXXXXXXXX connected    10         a-full a-1000 10/100/1000BaseTX
   /0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX
   /0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
   /0/5   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
   /0/6   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX
   /0/7   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX
   /0/1   *** MOG2SWXXXXXXXX connected    trunk        full    10G 10GBase-SR
   /0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX
   /0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
   /0/5   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
   /0/6   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX
   /0/7   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX
   /0/1   *** MOG2SWXXXXXXXX connected    trunk        full    10G 10GBase-SR
          *** SW1+2-XXXXXXXX connected    trunk      a-full    10G
          *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000
          *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000
          *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000
 - DONE -

真实档案：

cat -e TF5_MOG2_SW2-EU-A50R1-DC7-1
^M$
^M$
Port      Name               Status       Vlan       Duplex  Speed Type^M$
Gi1/0/2   v5.7-TF5-FXXXXXXXX connected    10         a-full a-1000 10/100/1000BaseTX^M$
Gi1/0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX^M$
Gi1/0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX^M$
Gi1/0/5   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX^M$
Gi1/0/6   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX^M$
Gi1/0/7   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX^M$
Te1/0/1   *** MOG2SWXXXXXXXX connected    trunk        full    10G 10GBase-SR^M$
Gi2/0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX^M$
Gi2/0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX^M$
Gi2/0/5   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX^M$
Gi2/0/6   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX^M$
Gi2/0/7   v8.12-TF5-XXXXXXXX connected    trunk      a-full a-1000 10/100/1000BaseTX^M$
Te2/0/1   *** MOG2SWXXXXXXXX connected    trunk        full    10G 10GBase-SR^M$
Po1       *** SW1+2-XXXXXXXX connected    trunk      a-full    10G ^M$
Po4       *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000 ^M$
Po6       *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000 ^M$
Po7       *** TF5-NAXXXXXXXX connected    trunk      a-full a-1000 ^M$

1 个答案:

答案 0 :(得分：0)

awk并没有删除第一个字符 - 嵌入式CR就是问题 - SHELL将其解释为“在这一行上找到第一个位置”的指令......

注意 - 在Linux系统上测试 - 不确定您正在使用哪种操作系统... 

## note the ^MS represents a non-printable character; function below is for illustration  
function show_test_data { ## which included real'^MS'
cat << EOM
Port      Name               Status       Vlan       Duplex  Speed Type
Gi1/0/2   v5.7-TF5-FXXXXXXXX connected    10         a-full a-1000 10/100/1000BaseTX^MS
Gi1/0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX^MS
Gi1/0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX^MS
EOM
}
##
function show_data {
cat $entry
}
###
function stars {
printf "\n\t## $@ ##\n"
}
###
stars "No change"
show_data | \
         awk 'BEGIN {print "BEGIN" } { print $0 " "} END { print " - DONE -" } '
stars " Change CR to Hash "
show_data | tr '\r' '#' | \
         awk 'BEGIN {print "BEGIN" } { print $0 " "} END { print " - DONE -" } '
stars " Remove CR"
show_data | tr -d '\r' | \
         awk 'BEGIN {print "BEGIN" } { print $0 " "} END { print " - DONE -" } '
stars

示例运行## 

        ## No change ##
BEGIN
 ort      Name               Status       Vlan       Duplex  Speed Type
 i1/0/2   v5.7-TF5-FXXXXXXXX connected    10         a-full a-1000 10/100/1000BaseTX
 i1/0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX
 i1/0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
 - DONE -

        ##  Hash  ##
BEGIN
Port      Name               Status       Vlan       Duplex  Speed Type#
Gi1/0/2   v5.7-TF5-FXXXXXXXX connected    10         a-full a-1000 10/100/1000BaseTX#
Gi1/0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX#
Gi1/0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX#
 - DONE -

        ##  Remove CR ##
BEGIN
Port      Name               Status       Vlan       Duplex  Speed Type
Gi1/0/2   v5.7-TF5-FXXXXXXXX connected    10         a-full a-1000 10/100/1000BaseTX
Gi1/0/3   v5.22-TF5-XXXXXXXX connected    210        a-full a-1000 10/100/1000BaseTX
Gi1/0/4   v6.34-TF5-XXXXXXXX connected    trunk        full   1000 10/100/1000BaseTX
 - DONE -

:)
戴尔

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