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Top Forums Shell Programming and Scripting Add character to specific columns using sed or awk and make it a permanent change Post 302958293 by Don Cragun on Wednesday 21st of October 2015 03:46:23 AM
Old 10-21-2015
Quote:
Originally Posted by ashima jain
Rudic can you explain !s
sed '/{/ !s/^/#/' file
From the standards:
Quote:
A function can be preceded by one or more '!' characters, in which case the function shall be applied if the addresses do not select the pattern space. Zero or more <blank> characters shall be accepted before the first '!' character. It is unspecified whether <blank> characters can follow a '!' character, and conforming applications shall not follow a '!' character with <blank> characters.
Or, translated from standardese, perform the specified substitution (insert an octothorpe at the start of a line) on lines that do not contain an open brace character.
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asa(1)							      General Commands Manual							    asa(1)

NAME
asa - interpret ASA carriage control characters SYNOPSIS
[files] DESCRIPTION
interprets the output of FORTRAN programs that utilize ASA carriage control characters. It processes either the files whose names are given as arguments, or the standard input if is specified or if no file names are given. The first character of each line is assumed to be a control character. The following control characters are interpreted as indicated: (blank) Output a single new-line character before printing. (space) (UNIX Standard only, see standards(5)) The rest of the line will be output without change. A <newline> shall be output, then the rest of the input line. Output a new-page character before printing. Overprint previous line. (UNIX Standard only, see standards(5)) The <newline> of the previous line shall be replaced with one or more implementation-defined characters that causes printing to return to column position 1, followed by the rest of the input line. If the + is the first character in the input, it shall have the same effect as <space>. Lines beginning with other than the above characters are treated the same as lines beginning with a blank. The first character of a line is printed. If any such lines appear, an appropriate diagnostic is sent to standard error. This program forces the first line of each input file to start on a new page. (UNIX Standard only, see standards(5)) The action of the asa utility is unspecified upon encountering any character other than those listed above as the first character in a line. To view the output of FORTRAN programs which use ASA carriage control characters and have them appear in normal form, can be used as a fil- ter: The output, properly formatted and paginated, is then directed to the line printer. FORTRAN output previously sent to a file can be viewed on a user terminal screen by using: EXTERNAL INFLUENCES
For information about the UNIX standard environment, see standards(5). Environment Variables determines the interpretation of text within file as single- and/or multi-byte characters. determines the language in which messages are displayed. If or is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty variable. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multi-byte character code sets are supported. SEE ALSO
efl(1), f77(1), ratfor(1), standards(5). STANDARDS CONFORMANCE
asa(1)
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