组织Grep输出

Question

需要帮助显示所需输出，如下面的示例所示。提前感谢！

我有这个(没有子弹)：

SWTICH1:interface GigabitEthernet1/0/1
SWTICH1: switchport mode access
SWTICH1:interface GigabitEthernet1/0/2
SWTICH1: switchport mode access
SWTICH1:interface GigabitEthernet1/0/3
SWTICH1: switchport mode access
SWTICH1:interface GigabitEthernet1/0/4
SWTICH1: switchport mode access
SWTICH1:interface GigabitEthernet1/0/5
SWTICH1: switchport mode access
SWTICH1:interface GigabitEthernet1/0/6
SWTICH1: switchport mode access

SWTICH2:interface GigabitEthernet1/0/1
SWTICH2: switchport mode access
SWTICH2:interface GigabitEthernet1/0/2
SWTICH2: switchport mode access
SWTICH2:interface GigabitEthernet1/0/3
SWTICH2: switchport mode access
SWTICH2:interface GigabitEthernet1/0/4
SWTICH2: switchport mode access
SWTICH2:interface GigabitEthernet1/0/5
SWTICH2: switchport mode access
SWTICH2:interface GigabitEthernet1/0/6
SWTICH2: switchport mode access

我希望它像这样(没有子弹)：

SWTICH1:
interface GigabitEthernet1/0/1
switchport mode access
interface GigabitEthernet1/0/2
switchport mode access
interface GigabitEthernet1/0/3
switchport mode access
interface GigabitEthernet1/0/4
switchport mode access
interface GigabitEthernet1/0/5
switchport mode access
interface GigabitEthernet1/0/6
switchport mode access
SWTICH2:
interface GigabitEthernet1/0/1
switchport mode access
interface GigabitEthernet1/0/2
switchport mode access
interface GigabitEthernet1/0/3
switchport mode access
interface GigabitEthernet1/0/4
switchport mode access
interface GigabitEthernet1/0/5
switchport mode access
interface GigabitEthernet1/0/6
switchport mode access

Answer 1

编辑：，如ghoti先生的评论，添加了一个解决方案，这将提供一个输出顺序的开关关键字，并应在任何awk也工作。

awk -F':' '
NF{
  sub(/^ +/,"",$2)
}
!b[$1]++{
  c[++count]=$1
}
{
  a[$1]=(a[$1]?a[$1] ORS $2:$2)
}
END{
  for(i=1;i<=count;i++){
    print c[i] ORS a[c[i]]
  }
}'  Input_file

你能试试下面这个问题吗，看起来awk很适合这个问题。

awk -F':' 'NF{sub(/^ +/,"",$2);a[$1]=(a[$1]?a[$1] ORS $2:$2)} END{for(i in a){print i ORS a[i]}}' Input_file

说明:在这里添加解释。

awk -F':' '                        ##Setting field separator as colon here.
NF{                                ##Checking if NF value is NOT NULL where NF is number of fields in current line.
  sub(/^ +/,"",$2)                 ##Using sub function of awk which substitutes all initial/starting space from $2(second field) with NULL.
  a[$1]=(a[$1]?a[$1] ORS $2:$2)    ##Creating an array named a whose index is first field of current line and concatenating $2 values to its previous value.
}                                  ##Closing block for NF condition here.
END{                               ##Starting END condition of awk command here.
  for(i in a){                     ##Starting a for loop to traverse through array a here.
    print i ORS a[i]               ##Printing index of array a which is variable i now and ORS(new line) and then value of array a whose index is variable i.
  }                                ##Closing block for for loop here.
}'  Input_file                     ##Mentioning Input_file name here.

Answer 2

一个简单的awk解决方案可能如下所示：

awk -F: 'length() && $1!=s {s=$1;print s} {print $2}' input.txt

这是通过捕获第一个冒号分隔的“字段”来实现的，如果它与前面的行不同，则打印它.然后打印第二个“字段”，这是您的内容。如果您希望输出更精确地匹配，那么就很容易了：

awk -F: 'length() && $1!=s {s=$1;print s ":"} length() {gsub(/^ /,"",$2);print $2}' input.txt

我们使用length()作为条件，因为否则$1!=s测试将匹配空行。

或者，您可以单独在bash中这样做，实现类似的逻辑：

while IFS=: read a b; do [[ -n "$a" ]] && [[ $s != $a ]] && s="$a" && printf '%s:\n' "$s"; printf '%s\n' "${b## }"; done < input.txt

或者为了更容易阅读：

while IFS=: read a b; do
  if [[ -n "$a" ]] && [[ $s != $a ]]; then
    s="$a"
    printf '%s:\n' "$s"
  fi
  printf '%s\n' "${b## }"
done < input.txt

我已经将更复杂的格式包含在这个格式中。

Answer 3

另一个锥

$ awk -F: ' { if($1!=p) { print $1; p=$1; }  $1=""; print }' bantay.txt
SWTICH1
 interface GigabitEthernet1/0/1
  switchport mode access
 interface GigabitEthernet1/0/2
  switchport mode access
 interface GigabitEthernet1/0/3
  switchport mode access
 interface GigabitEthernet1/0/4
  switchport mode access
 interface GigabitEthernet1/0/5
  switchport mode access
 interface GigabitEthernet1/0/6
  switchport mode access


SWTICH2
 interface GigabitEthernet1/0/1
  switchport mode access
 interface GigabitEthernet1/0/2
  switchport mode access
 interface GigabitEthernet1/0/3
  switchport mode access
 interface GigabitEthernet1/0/4
  switchport mode access
 interface GigabitEthernet1/0/5
  switchport mode access
 interface GigabitEthernet1/0/6
  switchport mode access

$