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Shell Programming and Scripting
conditional statement
Post 302282578 by cfajohnson on Saturday 31st of January 2009 10:03:59 PM
01-31-2009
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how can i use awk or sed to do a conditional statement, so that
HH:MM
if MM not great than 30 , then MM=00
else MM=30
ie:
10:34 will display 10:30
10:29 will display 10:00
a=$(echo 10:34 | awk ......)
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can somebody help, what quote i should use in below statement or what wrong of it ?
the 1st (*) is a char, the 2nd and 3rd (*) is a wildcard
if ] && ] && ]
................^ .............^
then
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fi
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if
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LEARN ABOUT BSD
man
MAN(7) Miscellaneous Information Manual MAN(7) NAME
man - macros to typeset manual SYNOPSIS
nroff -man file ... troff -man file ... DESCRIPTION
These macros are used to lay out pages of this manual. A skeleton page may be found in the file /usr/man/man.template. Any text argument t may be zero to six words. Quotes may be used to include blanks in a `word'. If text is empty, special treatment is applied to the next input line with text to be printed. In this way .I may be used to italicize a whole line, or .SM may be followed by .B to make small bold letters. A prevailing indent distance is remembered between successive indented paragraphs, and is reset to default value upon reaching a non- indented paragraph. Default units for indents i are ens. Type font and size are reset to default values before each paragraph, and after processing font and size setting macros. These strings are predefined by -man: *R `(Reg)', trademark symbol in troff. *S Change to default type size. FILES
/usr/share/tmac/tmac.an /usr/man/man.template SEE ALSO
troff(1), man(1) BUGS
Relative indents don't nest. REQUESTS
Request Cause If no Explanation Break Argument .B t no t=n.t.l.*Text t is bold. .BI t no t=n.t.l. Join words of t alternating bold and italic. .BR t no t=n.t.l. Join words of t alternating bold and Roman. .DT no .5i 1i...Restore default tabs. .HP i yes i=p.i.* Set pre- vailing indent to i. Begin paragraph with hanging indent. .I t no t=n.t.l. Text t is italic. .IB t no t=n.t.l. Join words of t alternating italic and bold. .IP x i yes x="" Same as .TP with tag x. .IR t no t=n.t.l. Join words of t alternating italic and Roman. .LP yes - Same as .PP. .PD d no d=.4v Interparagraph distance is d. .PP yes - Begin paragraph. Set prevailing indent to .5i. .RE yes - End of relative indent. Set prevailing indent to amount of starting .RS. .RB t no t=n.t.l. Join words of t alternating Roman and bold. .RI t no t=n.t.l. Join words of t alternating Roman and italic. .RS i yes i=p.i. Start relative indent, move left margin in distance i. Set prevailing indent to .5i for nested indents. .SH t yes t=n.t.l. Subhead. .SM t no t=n.t.l. Text t is small. .TH n c x v m yes -Begin page named n of chapter c; x is extra commentary, e.g. `local', for page foot center; v alters page foot left, e.g. `4th Berkeley Distribution'; m alters page head center, e.g. `Brand X Programmer's Manual'. Set prevailing indent and tabs to .5i. .TP i yes i=p.i. Set prevailing indent to i. Begin indented paragraph with hanging tag given by next text line. If tag doesn't fit, place it on separate line. * n.t.l. = next text line; p.i. = prevailing indent 7th Edition October 22, 1996 MAN(7)