Microsoft Word - Linux_cheat_ sheet

!"#$command'%$!"#$%&'()*+(command,#(-&./&%($&0+(

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BASH cheat sheet - Level 2

Miscellaneous

\' (:#2&$+( 2*&;&2)+;<(=)($;+#+;>+#()*+(%")+;&%(>& %/+(? @(

)*+( .+A)( 2*&;&2)+;( )*&)( @?%%?B#C( B")*( )*+(

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$&;&-+)+;((.&-+((?;((#'-E?%()?(E+(+A$&.!+!(-&'(

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Using variables

variable<value$

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Print commands

&'()$My'home'is:'$HOME' ' O;")+(&;0/-+.)#()?()*+('

7C3$()!&$04%$8()!&8user' ' #)&.!&;!(?/)$/)<'

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Using quotes

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string<HC3$()!&$04%$9X Y C Z H$

&'()$9string$

7C3$()!&$04%$8()!&8user'

T#+( B *+.( '?/( B&.)( )?( +.2%?#+( >&;"&E%+#( ?;(

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Q;+#+;>+#( )*+( %")+;&%( >&%/+( ?@( +&2* ( 2*&;&2)+;(

B")*".()*+(3/?)+#<(

Wildcards operators

[&1+=",$&>6,&440)#4$%$ T#+!()?(-&)2*()+A)<$

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$]%class%^$ Q\M=]( ^*&;&2)+;( ^%&##+#( GUS&%./- SXC( US&%$ *&SXC(

USE%&.FSXC( US!"0")SXC( +)2C( ;+#$+2)">+%'( +3/">&%+.)( )?(

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?term1bte rm 2 A( M$+2"@'( &( %"#)( ?@( )+;-#( #+$&;&)+!( E'(

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File modification commands

tr'string1'string2$i'file$

`+$%&2+(string 1'2* &;&2)+;#( ?22/;;+. 2+#( B")*".(file ( E'(

string2. 2*&;&2)+;#( GB*+;+( )*+( @";#)( 2*&;&2)+;( ".(

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4&2$W#'5,106'file'

$ Q;".)(%".+#(9()?(87<'

The awk command

"./("#(&(@"+%!5?;"+.)+!($&))+;.($;?2+##".0(%&.0/&0+<(

(

awk 'BEGIN { Initial command(s) }

{ by line command(s) }

END { final command(s) }' file

9k("#(&.(+.)";+(%".+<(

9O("#()*+(@";#)(@"+%! C(9P()*+(#+2?.!C(+)2<(

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c'( !+@&/%)C( @"+%!#( &;+( #+$&;&)+!( E'( B*")+( #$&2+<( T#+(

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E+(&(;+0/%&;(+A$;+##"?.H<(

(

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( JB[( \;! ".&%(./-E+;(?@()*+(2/;;+.)( ;+2?;!(".(

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(

Wh$name<9var(( ( =)(&%%?B #()? ($&## ()*+(#*+ %%(

>&;"&E%+(dvar()?(&BF(2?--&. !<(D*+(>& ;"&E%+(

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"./$L?$0E$:$2$l$pattern;$arr]$0^aaA$ZBm$?$E),$:i$0#$

arr;?6,0#-$$iA$AL$file$

( P?;(+&2*(%".+(B*+;+()*+(#+2?.!(@"+%!(-&)2*(

)*+(patternC(#&>+()*+(% ". + (& # (F + ' (".()*+(&##?2"&)">+(

&;;&'(arr(&.!(".2;+-+.)(")#(>&%/+<(I)()*+(+.!($;".)(

+&2*(F+'(?@()*+(&##?2"&)">+(&;;&'<(D*"#(B"%%(;+-?>+()*+(

!/$%"2&)+(%".+#()*&)(*&>+(-&)2*+!<(

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"./$LJB[<<B[?arr]$4^aan#&>-A?$0E:$4$0#$arr;6,0#-$

9k$AL$file1$file2$

Q;".)(&%%(%".+#(?@(file2(B*+;+()*+(@?/;)*(@"+%!(

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String commands together

command$i$file''

`+!";+2)( file( ".)? ( &( command< ( File( "#( ;+&!( &#(

#)&.!&;!(".$/)(".#)+&!(?@()*+()+;-".&%(2?-- &. !<(

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command1$o$command2'

^?..+2)()*+(#)&.!&;!(?/)$/ )(?@()*+(%+@)(2?- - &. !(

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command1';'comm and2

M+$&;&)+( )B?( 2?--&. !#<( Q+;-")( $/))".0(

#+>+;&%(2?--&.!#(?.()*+(#&-+(%".+<(

Math calculation

a( Q%/#(

a<( Q%/#5+3/&%(G".2;+-+.)(>&;"&E%+(E'(&(2?.#)&.)H(

W$ J"./#<(

W<( J"./# 5 +3 /&%(G!+ 2;+- +. )(>&;"&E %+(E'(&(

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F(( J?!/%?(G;+)/;.#()*+(;+-& ".!+;(?@(&.(".)+0+;(

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F<( J?!/%?5+3/&%(G;+-&".!+;(?@(!">"!".0(>&;"&E%+(

E'(&(2?.#)&.)H<(

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aa(( =.2;+-+.)(&(>&;"&E%+(E'(8<(

WW( 4+2;+-+.)(&(>&;"&E%+(E'(8<(

(

(( var = operation )) or var=$(( operation ))

I##"0.()*+( ;+#/%)( ?@( &.( &;")*-+)"2(+>&%/&)"?.(

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e?/( -/#)( !+%+0&)+( #/2*( F".!( ?@( 2&%2/%( )?( #$ +2"@"2(

2?--&.!(%".+()??%(&#(d'<(

(

echo "operation" | bc –l

Display the result of a floating-point

arithmetic.

var=$(echo "operation " | bc -l)

Assign the floating-point arithmetic result

to the variable var.