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Full Discussion: issue in naming a file
Top Forums Shell Programming and Scripting issue in naming a file Post 302344659 by vimalr on Monday 17th of August 2009 08:53:33 AM
Old 08-17-2009
issue in naming a file

Hi,

I want to create a file named 'abc(+1)' and append the data of file 'abc' to it. But getting error as unexpected'(' when i tried to use the following command.

cat abc > abc(+1)

Is there any other way to include brackets along with +1 in the file name?

TIA.
 

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subst(n)						       Tcl Built-In Commands							  subst(n)

__________________________________________________________________________________________________________________________________________________

NAME
subst - Perform backslash, command, and variable substitutions SYNOPSIS
subst ?-nobackslashes? ?-nocommands? ?-novariables? string _________________________________________________________________ DESCRIPTION
This command performs variable substitutions, command substitutions, and backslash substitutions on its string argument and returns the fully-substituted result. The substitutions are performed in exactly the same way as for Tcl commands. As a result, the string argument is actually substituted twice, once by the Tcl parser in the usual fashion for Tcl commands, and again by the subst command. If any of the -nobackslashes, -nocommands, or -novariables are specified, then the corresponding substitutions are not performed. For example, if -nocommands is specified, command substitution is not performed: open and close brackets are treated as ordinary characters with no special interpretation. Note that the substitution of one kind can include substitution of other kinds. For example, even when the -novariables option is speci- fied, command substitution is performed without restriction. This means that any variable substitution necessary to complete the command substitution will still take place. Likewise, any command substitution necessary to complete a variable substitution will take place, even when -nocommands is specified. See the EXAMPLES below. If an error occurs during substitution, then subst will return that error. If a break exception occurs during command or variable substi- tution, the result of the whole substitution will be the string (as substituted) up to the start of the substitution that raised the excep- tion. If a continue exception occurs during the evaluation of a command or variable substitution, an empty string will be substituted for that entire command or variable substitution (as long as it is well-formed Tcl.) If a return exception occurs, or any other return code is returned during command or variable substitution, then the returned value is substituted for that substitution. See the EXAMPLES below. In this way, all exceptional return codes are "caught" by subst. The subst command itself will either return an error, or will complete successfully. EXAMPLES
When it performs its substitutions, subst does not give any special treatment to double quotes or curly braces (except within command sub- stitutions) so the script set a 44 subst {xyz {$a}} returns "xyz {44}", not "xyz {$a}" and the script set a "p} q {r" subst {xyz {$a}} returns "xyz {p} q {r}", not "xyz {p} q {r}". When command substitution is performed, it includes any variable substitution necessary to evaluate the script. set a 44 subst -novariables {$a [format $a]} returns "$a 44", not "$a $a". Similarly, when variable substitution is performed, it includes any command substitution necessary to retrieve the value of the variable. proc b {} {return c} array set a {c c [b] tricky} subst -nocommands {[b] $a([b])} returns "[b] c", not "[b] tricky". The continue and break exceptions allow command substitutions to prevent substitution of the rest of the command substitution and the rest of string respectively, giving script authors more options when processing text using subst. For example, the script subst {abc,[break],def} returns "abc,", not "abc,,def" and the script subst {abc,[continue;expr {1+2}],def} returns "abc,,def", not "abc,3,def". Other exceptional return codes substitute the returned value subst {abc,[return foo;expr {1+2}],def} returns "abc,foo,def", not "abc,3,def" and subst {abc,[return -code 10 foo;expr {1+2}],def} also returns "abc,foo,def", not "abc,3,def". SEE ALSO
Tcl(n), eval(n), break(n), continue(n) KEYWORDS
backslash substitution, command substitution, variable substitution Tcl 7.4 subst(n)

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