Query: subst
OS: debian
Section: 1
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
SUBST(1) General Commands Manual SUBST(1)NAMEsubst - substitute definitions into file(s)SYNOPSISsubst [ -e editor ] -f substitutions victim ...DESCRIPTIONSubst makes substitutions into files, in a way that is suitable for customizing software to local conditions. Each victim file is altered according to the contents of the substitutions file. The substitutions file contains one line per substitution. A line consists of two fields separated by one or more tabs. The first field is the name of the substitution, the second is the value. Neither should contain the character `#', and use of text-editor metacharacters like `&' and `' is also unwise; the name in particular is best restricted to be alphanumeric. A line starting with `#' is a comment and is ignored. In the victims, each line on which a substitution is to be made (a target line) must be preceded by a prototype line. The prototype line should be delimited in such a way that it will be taken as a comment by whatever program processes the file later. The prototype line must contain a ``prototype'' of the target line bracketed by `=()<' and `>()='; everything else on the prototype line is ignored. Subst extracts the prototype, changes all instances of substitution names bracketed by `@<' and `>@' to their values, and then replaces the tar- get line with the result.OPTIONS-e Substitutions are done using the sed(1) editor, which must be found in either the /bin or /usr/bin directories. To specify a dif- ferent executable, use the ``-e'' flag.EXAMPLEIf the substitutions file is FIRST 111 SECOND 222 and the victim file is x = 2; /* =()<y = @<FIRST>@ + @<SECOND>@;>()= */ y = 88 + 99; z = 5; then ``subst -f substitutions victim'' changes victim to: x = 2; /* =()<y = @<FIRST>@ + @<SECOND>@;>()= */ y = 111 + 222; z = 5;FILESvictimdir/substtmp.new new version being built victimdir/substtmp.old old version during renamingSEE ALSOsed(1)DIAGNOSTICSComplains and halts if it is unable to create its temporary files or if they already exist.HISTORYWritten at U of Toronto by Henry Spencer. Rich $alz added the ``-e'' flag July, 1991.BUGSWhen creating a file to be substed, it's easy to forget to insert a dummy target line after a prototype line; if you forget, subst ends up deleting whichever line did in fact follow the prototype line. 25 Feb 1990 SUBST(1)
Related Man Pages |
---|
subst(1t) - opensolaris |
subst(n) - centos |
subst(3tcl) - debian |
subst(n) - opendarwin |
subst(n) - osx |
Similar Topics in the Unix Linux Community |
---|
new line at last line |
Remove the contents of a file without deleting the file |
How to rewrite a line in a file |
sed help. |
how to insert a string as a first line of the file |