Reputation: 612

How to skip the expression in the beginning and ending of the string using Linux commands

sh GetPrivateKey appname returns below output

I want to format it as a private key. So I have written below command which finds the space ( " " ) in above output and displays line by line, however I don't want to split -----BEGIN RSA PRIVATE KEY----- and -----END RSA PRIVATE KEY----- (including the space at the end of them)

[user@server]$ echo `sh GetPrivateKey appname`\ | tr " " "\n"
-----BEGIN
RSA
PRIVATE
KEY-----
JDkldlkdlkdldldlk1G/XhgJk4TXeQ06OIunFDUVfWcvCZ+X-dkjdkjdjkdjkdjk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-----END
RSA
PRIVATE
KEY-----

I think my requirement satisfies with sed commands however I am pretty much new in Linux commands. Your help will be appreciated.

Expected output :

Upvotes: 2

Answers (3)

Ed Morton

Reputation: 204258

With any awk:

$ awk -v OFS='\n' '{
    beg = end = $0
    sub(/- .*/,"-",beg)
    sub(/.* -/,"-",end)
    gsub(/^.*- | -.*$/,"")
    $1 = $1
    print beg, $0, end
}' file
-----BEGIN RSA PRIVATE KEY-----
JDkldlkdlkdldldlk1G/XhgJk4TXeQ06OIunFDUVfWcvCZ+X-dkjdkjdjkdjkdjk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-----END RSA PRIVATE KEY-----

Upvotes: 0

RavinderSingh13

Reputation: 133680

Based on your shown samples, could you please try following, written in GNU awk.

awk '
match($0,/KEY-+.*-+END/){
  val=substr($0,RSTART,RLENGTH)
  num=split(val,arr," ")
  print substr($0,1,RSTART-1) arr[1]
  for(i=2;i<num;i++){
     print arr[i]
  }
  print arr[num] substr($0,RSTART+RLENGTH)
}
' Input_file

Explanation: Adding detailed explanation for above.

awk '                                        ##Starting awk program from here.
match($0,/KEY-+.*-+END/){                    ##Using match function to match regex KEY-+.*-+END in current line.
  val=substr($0,RSTART,RLENGTH)              ##Creating val which has sub string of matched regex.
  num=split(val,arr," ")                     ##Splitting val into array arr.
  print substr($0,1,RSTART-1) arr[1]         ##printing sub string before matched regex character and printing array 1st element.
  for(i=2;i<num;i++){                        ##Going through all elements of arr here.
     print arr[i]                            ##Printing arr element with index i here.
  }
  print arr[num] substr($0,RSTART+RLENGTH)   ##Printing rest of line after matched regex.
}
' Input_file

Upvotes: 0

anubhava

Reputation: 785721

You may try this gnu awk:

awk -v RS='-{5}(BEGIN|END) [^-]* KEY-{5}' '{
gsub(/ /, "\n"); ORS=RT} 1' file.rsa

Or using perl:

perl -pe 's/-{5}(BEGIN|END) [^-]* KEY-{5}(*SKIP)(*F)|\h/\n/g' file.rsa

Output:

Upvotes: 2

How to skip the expression in the beginning and ending of the string using Linux commands

Answers (3)

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