82 lines
2.3 KiB
Plaintext
Executable File
82 lines
2.3 KiB
Plaintext
Executable File
# This testcase demonstrates that backslashes are treated differently
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# in 1st and 2nd parts of ${var/search/repl}:
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# if quoted ("${var/search/repl}"), and repl contains \a (a non-special char),
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# the backslash in repl stays; if unquoted, backslash is removed.
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# But search part does not act like that: \a is always converted to just a,
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# even in quotes.
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#
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# bash4 (and probably bash3 too): "Quoted:" results are different from
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# unquoted expansions - they have a backslash before z.
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#
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# The difference only exists if repl is a literal. If it is a variable:
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# ${v/.../$s}, then all backslashes are preserved in both cases.
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v='a*b\*c'
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echo 'Source: ' "$v"
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echo 'Replace str: ' '_\\_\z_'
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echo 'Pattern: ' 'single backslash and star: "replace literal star"'
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echo 'Unquoted: ' ${v/\*/_\\_\z_}
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r=${v/\*/_\\_\z_}
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echo 'Unquoted =: ' "$r"
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echo 'Quoted: ' "${v/\*/_\\_\z_}"
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r="${v/\*/_\\_\z_}"
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echo 'Quoted =: ' "$r"
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echo 'Pattern: ' 'double backslash and star: "replace backslash and everything after it"'
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echo 'Unquoted: ' ${v/\\*/_\\_\z_}
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r=${v/\\*/_\\_\z_}
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echo 'Unquoted =: ' "$r"
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echo 'Quoted: ' "${v/\\*/_\\_\z_}"
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r="${v/\\*/_\\_\z_}"
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echo 'Quoted =: ' "$r"
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echo
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v='a\bc'
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echo 'Source: ' "$v"
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echo 'Replace str: ' '_\\_\z_'
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echo 'Pattern: ' 'single backslash and b: "replace b"'
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echo 'Unquoted: ' ${v/\b/_\\_\z_}
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r=${v/\b/_\\_\z_}
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echo 'Unquoted =: ' "$r"
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echo 'Quoted: ' "${v/\b/_\\_\z_}"
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r="${v/\b/_\\_\z_}"
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echo 'Quoted =: ' "$r"
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echo 'Pattern: ' 'double backslash and b: "replace backslash and b"'
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echo 'Unquoted: ' ${v/\\b/_\\_\z_}
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r=${v/\\b/_\\_\z_}
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echo 'Unquoted =: ' "$r"
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echo 'Quoted: ' "${v/\\b/_\\_\z_}"
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r="${v/\\b/_\\_\z_}"
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echo 'Quoted =: ' "$r"
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echo
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v='a\bc'
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s='_\\_\z_'
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echo 'Source: ' "$v"
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echo 'Replace str: ' "$s" '(as variable $s)'
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echo 'Pattern: ' 'single backslash and b: "replace b"'
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echo 'Unquoted: ' ${v/\b/$s}
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r=${v/\b/$s}
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echo 'Unquoted =: ' "$r"
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echo 'Quoted: ' "${v/\b/$s}"
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r="${v/\b/$s}"
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echo 'Quoted =: ' "$r"
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echo 'Pattern: ' 'double backslash and b: "replace backslash and b"'
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echo 'Unquoted: ' ${v/\\b/$s}
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r=${v/\\b/$s}
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echo 'Unquoted =: ' "$r"
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echo 'Quoted: ' "${v/\\b/$s}"
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r="${v/\\b/$s}"
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echo 'Quoted =: ' "$r"
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echo
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echo Done: $?
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