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Top Forums Shell Programming and Scripting sed multiline substitution if a condition holds Post 302564734 by binlib on Friday 14th of October 2011 01:04:31 PM
Old 10-14-2011
If you insists on using sed:
Code:
sed "/varx =/h
/vary = /{
G
s/\(.*vary = '\)[^']*\('.*\)\n.*varx = 'false'.*/\1NEW_VAL_1\2/
t # optional
s/\(.*vary = '\)[^']*\('.*\)\n.*varx = 'true'.*/\1NEW_VAL_2\2/
}" file

This User Gave Thanks to binlib For This Post:
 

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true(1) 						      General Commands Manual							   true(1)

NAME
true, false - Returns a standard exit value SYNOPSIS
true false STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: true: XCU5.0 false: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. DESCRIPTION
The true command returns a 0 (zero) exit value. The false command returns a nonzero exit value. These commands are usually used in input to shell commands. NOTES
The special built-in utility : (colon) is sometimes more efficient than the true command. EXIT STATUS
[Tru64 UNIX] The nonzero value returned by the false command may vary from system to system. EXAMPLES
To construct a loop in a shell procedure, enter: while true do date sleep 60 done This procedure displays the date and time once a minute. To stop it, press the Interrupt key sequence. SEE ALSO
Commands: csh(1), ksh(1), Bourne Shell sh(1b), POSIX shell sh(1p) Standards: standards(5) true(1)
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