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21 lines
557 B
Tcl
21 lines
557 B
Tcl
#!/usr/bin/tcl
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#
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# Replace string with another string -OR- include
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# only lines successfully modified with a regular
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# expression.
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#
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set mode [string tolower [lindex $argv 0]]
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set from [lindex $argv 1]
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set to [lindex $argv 2]
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if {$mode ni [list exact include]} {exit 1}
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if {[string length $from]==0} {exit 2}
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while {![eof stdin]} {
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set line [gets stdin]
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if {[eof stdin]} break
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switch -exact $mode {
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exact {set line [string map [list $from $to] $line]}
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include {if {[regsub -all -- $from $line $to line]==0} continue}
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}
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puts stdout $line
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}
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