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Top Forums Shell Programming and Scripting sed - searching token in certain order Post 302851411 by Don Cragun on Sunday 8th of September 2013 09:05:28 PM
Old 09-08-2013
Originally Posted by jcdole
I know little about sed, I know nothing about awk.
That didn't answer the question. Will you accept a solution for this problem that uses awk?
Originally Posted by jcdole
I have try this :
my_function () {
sed -n '/^$1/,$p  $2 | sed -n '/^$3/,p' | sed '/$5/ q'

In the following text sample :
Thank you for the input sample, seeing it helped.
I have deleted it here to save space.

Now calling the function with these parameters
my_function "In the Linux startup process" "./file_text.txt" "Like init" "manages" "ways"

This find $1 in file $2, and then find $3 before $5.
This give a few lines beginning with $3 and last line ending with $5
There are a few problems here:
  1. You're using the wrong quotes to do what you want. (Positional parameters are not expanded inside single-quoted strings.)
  2. Your quotes aren't matched. (You have 5 single quotes in these 3 sed commands.)
  3. In the 1st message in this thread you said the 1st argument to your function was the file name; here it is the 2nd argument. Which should it be?
  4. In the 1st message in this thread you said the 5th argument was a single character; "ways" is not a single character. What is the real requirement?
  5. In the 1st message in this thread you said the 3rd argument had to appear at the start of a line, after a <space> character, or after a <tab> character. Your script seems to only allow for the 1st of these three options. Is this still a requirement?
Originally Posted by jcdole
2nd sample deleted to save space.

Now searching with $4 = manages in the first line will return true
and searching with $4 = background in the first line will return false

Thank you for taking time to help me.
Do you really need to return the strings "true" and "false"; or are exit codes zero and non-zero, respectively, sufficient.
Test Your Knowledge in Computers #586
Difficulty: Medium
Making many function calls can be costly in terms of stack space. One optimization that can be made is to use tail recursion.
True or False?

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