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30 Cards in this Set
- Front
- Back
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ll - a
erase files Multiple Line Comments |
See system files; rm (name); begin with /* and end with */
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duplicate
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cp (sourcename destname)
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next line
next screen |
more; spacebar
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online help
online help, name not exact |
man (commandname)
man - k (commandname) |
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duplicate screen contents
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script (name)
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merge two or more files
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cat (file1 file2)
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print
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cat (filename) | lp or
spool (filename) |
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Click __ onto , [ { to find mate
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%
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End of file cursor
To delete char. at cursor To replace char. at cursor To substitute more than one char for char at cursor |
G
x r S |
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To join current with next line;
to replace all occurrences of a text pattern withanother |
J
g (g/pattern/s//newpattern/g) |
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Algorithm
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1) step by step solution to problem
2) Must end in result/output 3) Steps must be in order 4) Clear and specific 5) Finite number of steps - IPO chart - Start with general procedure then refine. |
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CPU
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CU and ALU; CU: sequences through instruc. of the currently active program and alerts other subsys.
ALU performs the artithmetic and logical operations. |
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Main memory
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Where active program must reside while executing; aka RAM, primary memory, internal mem.
- Fast, elec. storage with index and contents; Volatile (erased when computer is turned off). |
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Bit; byte
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bit: binary digit, 0 or 1, smallest element.
byte: amount of storage space for a single char. |
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Main mem address.
Address vs. value at a location |
Position in memory; the first index/address is zero and the last depends on size.
The value is the content. |
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Bytes in 1KB = ____;
1 MB = ____; 1 GB = ____. |
1024 bytes,
(1024)^2 bytes, (1024)^3 bytes, |
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Currently executing program: ____; Seqential, direct, random access.
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main mem
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Seq. access. ex.
Direct access. ex. Random access. ex. |
tape.
cds. same retrieval time, RAM, ROM |
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Input sys ex.
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Info from outside world to inside memory; mouse and disk drives and mag. tape drives, disk drives.
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Output sys ex.
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Info from mem to be shared with outside world; ex. printer, monitor and mag. tape drives, disk drives.
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Secondary memory
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External, func: additional storage; permanent yet delicate; larger, cheaper, not ram, must be transferred to main mem for execution; ex. mag. tapes, disks, zip disks, cds, punched cards, tapes; direct or seq. access
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hardware vs. software
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physical elec. equip vs. programs executable in RAM (easier to change); HLL, Applications
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# include:
<cmath> <iomanip> <iostream> cout << setw(1) << setprecision(3) |
Access to math func;
Access to appearance of output; Access to in/output. |
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main ()
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Start of function main in integers.
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cin >>
cout << pow sqrt cos |
Input, accept data.
Output, display. pow(base, power) sqrt(number) cos(radians) |
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Return a func. to its activating unit.
Declaration statement; value cannot change. |
return; const
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Integer, includes zero, counting, commas, list.
Decimals, fractions, measuring. |
int
float |
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ceil
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Integer smallest not less than x: 49.1 is 50, 49.0 is 49.
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floor
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Integer value after dec. truncated: floor(x*10 + 0.5)) / 10.0; 15.4 after 0.5 added and divided is 15; 15.5 is 16; 15.9 is 16.
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Degrees to radians
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radians = 4.0 atan(1.0)*degrees/180
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