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Annotation of researchv10dc/dist/man/v4/man1/if.1, revision 1.1.1.1

1.1       root        1: .th IF I 3/15/72
                      2: .sh NAME
                      3: if \*-  conditional command
                      4: .sh SYNOPSIS
                      5: .bd if
                      6: expr command [ arg ... ]
                      7: .sh DESCRIPTION
                      8: .it If
                      9: evaluates the expression
                     10: .it expr,
                     11: and if its value is
                     12: true,
                     13: executes the given
                     14: .it command
                     15: with the given arguments.
                     16: .s3
                     17: The following primitives are used to construct
                     18: the
                     19: .it expr:
                     20: .s3
                     21: .lp +10 10
                     22: \fB\*-r\fR|file        true if the file exists and is readable.
                     23: .s3
                     24: .lp +10 10
                     25: \fB\*-w|\fRfile        true if the file exists and is writable
                     26: .s3
                     27: .lp +10 10
                     28: s1|\fB=|\fRs2  true
                     29: if the strings
                     30: .it s1
                     31: and
                     32: .it s2
                     33: are equal.
                     34: .s3
                     35: .lp +10 10
                     36: s1|\fB!=|\fRs2 true
                     37: if the strings
                     38: .it s1
                     39: and
                     40: .it s2
                     41: are not equal.
                     42: .s3
                     43: .i0
                     44: These primaries may be combined with the
                     45: following operators:
                     46: .s3
                     47: .lp +10 10
                     48: \fB!\fR        unary negation operator
                     49: .s3
                     50: .lp +10 10
                     51: \fB\*-a\fR     binary
                     52: .it and
                     53: operator
                     54: .s3
                     55: .lp +10 10
                     56: \fB\*-o\fR     binary
                     57: .it or
                     58: operator
                     59: .s3
                     60: .lp +10 10
                     61: \fB(|\fRexpr\fB|)\fR   parentheses for grouping.
                     62: .s3
                     63: .i0
                     64: .bd \*-a
                     65: has higher precedence than
                     66: .bd \*-o.
                     67: Notice that all the operators and flags are separate
                     68: arguments to
                     69: .it if
                     70: and hence must be surrounded by spaces.
                     71: Notice also that parentheses are meaningful
                     72: to the Shell and must be escaped.
                     73: .sh "SEE ALSO"
                     74: sh(I)
                     75: .sh BUGS

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