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Full Discussion: awk - passing variables in and out
Top Forums Shell Programming and Scripting awk - passing variables in and out Post 302955493 by MadeInGermany on Thursday 17th of September 2015 04:33:51 PM
Old 09-17-2015
Pass in variables: awk -v var1="$var1" -v var2="$var2" ...
For safety in the shell each $variable in command arguments should be quoted!
Pass out variables works with eval:
Code:
eval `
echo 2 3 | awk '{ result=$1+$2; printf "result='\'%s\''\n", result }'
`
echo "$result"

For safety the variable's value is put in 'ticks'.
NB this method works with more than one variables.
For one variable the following is much simpler:
Code:
result=`
echo 2 3 | awk '{ result=$1+$2; print result }'
`
echo "$result"

NB the old-style backticks can be replaced by $( ) e.g.
Code:
result=$(
 echo 2 3 | awk '{ result=$1+$2; print result }'
)

Last edited by MadeInGermany; 09-17-2015 at 05:47 PM..
 

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LEARN ABOUT OPENDARWIN

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
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Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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