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15 Cards in this Set
- Front
- Back
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Does globbing (.. .*) occur within a quoted string? |
No |
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What does a backslash escape? |
Any character |
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What does a backquote or $() do? |
Execute text as a command and substitute with command output |
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What does a single quote protect (print)? |
Everything even newline except single quote |
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Can a single quote appear in a single quoted string? |
No because it cannot be escaped |
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What happens to text adjacent to a string? Ex: echo "xx"yy |
Concatenated to xxyy |
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How to move to previous working directory? |
cd - |
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How to print absolute path to working directory when you're lost? |
pwd |
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How to access list of past commands and access them? |
history
!N run command N !! run last command !xyz run last command starting with string xyz |
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How to access list of past commands and access them? |
history
!N run command N !! run last command !xyz run last command starting with string xyz |
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How to alias a command? |
alias cmd=string
alias d=date |
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Can an alias be a command argument? |
No |
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How do you see what an alias is interpreted as? |
type alias |
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What does "time myprog" do? |
Execute a command and print a time summary |
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What 2 parts is program execution time composed of and what do each mean? What is the sum of these parts? |
User time: CPU time used during the execution of a program
System time: CPU time used by the OS in support of executing a program (ex file or network access)
Program execution is interleaved with other programs.
user + system ~ real-time |
