CODEWITHSUNDEEP
sedpattern-matching
Rusty Lemur
Rusty Lemur

Reputation: 1875

sed print text between PATTERN1 and PATTERN2 OR PATTERN3

Can sed print text between PATTERN1 and PATTERN2 OR PATTERN3? For instance, for both samples below I want the output shown:

Sample 1

Not lemur
Lemur
  Ring-Tailed
  Mouse
  Catta
Fusa
  Bad

Sample 2

Not lemur
Lemur
  Ring-Tailed
  Mouse
  Catta

Desired output:

Lemur
  Ring-Tailed
  Mouse
  Catta

My sed command so far is sed -n '/^Lemur/,$p', but that also prints the "Fusa\n Bad", which I don't want. Does sed have an "OR" feature, like '/^Lemur/,($|^[^\s])p' with the intent to match from Lemur to the end of the input or a line that does not start with whitespace. Also, I want to only print the lines after the first pattern (Lemur) that start with whitespace (i.e. I do not want to print "Fusa" in the first sample).

Upvotes: 0

Views: 420

Answers (2)

potong
potong

Reputation: 58361

This might work for you (GNU sed):

sed ':a;/^Lemur/{:b;n;/^\S/ba;bb};d' file

Label the beginning of the the cycle.

If a line begins with the word Lemur:

  • Label the beginning of a loop.
  • Print current line and fetch the next into the pattern space.
  • If the pattern space begins with a non space-like character, go to the beginning of the cycle and repeat.
  • Otherwise go to the beginning of the loop.

All other lines delete.

An alternative:

sed -n '/^\S/{:a;x;/^Lemur/p;$q;x;h};//!H;$ba' file

Upvotes: 1

Ed Morton
Ed Morton

Reputation: 203169

sed is the best tool for doing s/old/new/ on individual strings. For anything more complicated than that, just use awk.

$ awk '/^\S/{f=/^Lemur/} f' file1
Lemur
  Ring-Tailed
  Mouse
  Catta

$ awk '/^\S/{f=/^Lemur/} f' file2
Lemur
  Ring-Tailed
  Mouse
  Catta

If you don't have GNU awk for \S then just use [^[:space:]] instead.

Upvotes: 1

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