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Not figured by me, but a colleague of mine.
See the total amount of data on an AIX machine.
Tail is much faster than sed, awk because it doesn't check for regular expressions.
- View non printable characters.
- view binary files
Alternatively:
export MyVAR=84; awk '{ print ENVIRON["MyVAR"] }'
This uses some tricks I found while reading the bash man page to enumerate and display all the current environment variables, including those not listed by the 'env' command which according to the bash docs are more for internal use by BASH. The main trick is the way bash will list all environment variable names when performing expansion on ${!A*}. Then the eval builtin makes it work in a loop.
I created a function for this and use it instead of env. (by aliasing env).
This is the function that given any parameters lists the variables that start with it. So 'aae B' would list all env variables starting wit B. And 'aae {A..Z} {a..z}' would list all variables starting with any letter of the alphabet. And 'aae TERM' would list all variables starting with TERM.
aae(){ local __a __i __z;for __a in "$@";do __z=\${!${__a}*};for __i in `eval echo "${__z}"`;do echo -e "$__i: ${!__i}";done;done; }
And my printenv replacement is:
alias env='aae {A..Z} {a..z} "_"|sort|cat -v 2>&1 | sed "s/\\^\\[/\\\\033/g"'
From: http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html
The pdf is first converted to a bitmap, so change "-density" to match your printer resolution. Also be careful about the RAM required.
In this example rgb(0,0,0) is replaced by rgb(255,255,255), change to suit your needs.
Can be used for other commands as well, replace rm with ls.
It is easy to make this shorter but if the filenames involved have spaces, you will need to do use find's "-print0" option in conjunction with xargs's "-0" option. Otherwise the shell that xargs uses to execute the "rm" command line will treat the space as a token separator, thereby treating the name as two (or more) names.