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Full Discussion: Regular Expressions
Top Forums UNIX for Advanced & Expert Users Regular Expressions Post 302195825 by era on Friday 16th of May 2008 03:08:38 AM
Old 05-16-2008
Quote:
Originally Posted by ramky79
# Save, disable, and restore the verbose flag - any
# verbose output would look like errors.
typeset verbose="$(set -o |sed -n 's/^verbose *//p')"
set +v
This one even has a comment to explain what it does. It disables verbose debugging (disables set -v if set), remembering the previous state of the flag in the verbose variable.

Quote:
# Strip the "Connecting to host..." line, prompts, blank lines
# and login banners. What's left should only be error messages.
typeset errs="$(echo "$msgs" |
sed -e '/^Connecting to .*\.\.\.$/d' \
-e 's/sftp > //g' \
-e '/^[ ]*$/d' \
-e '/^#/d' \
-e '/^[-dDlbcps][-rwxsStTlL]\{9\}+\{0,1\} /d')"
Again, the comments are probably better than any detailed attempt at going through the individual regular expressions. Any "Connecting to ..." line is removed. Any sftp> prompt is removed. Any empty line is removed. Any line beginning with a hash sign is removed. The last one looks vaguely like it's intended to remove directory listing output.

Quote:
echo "$msgs" |
while read line
do
case "$line" in -*\ $wild)
echo ${line##* }
;;esac
done
This prints any line from $msgs which matches a dash, followed by anything, followed by a space, followed by the value of the variable $wild, with everything up to the last space trimmed away. (None of this involves any regular expressions, strictly speaking; both the case statement and the ${var##subst} interpolation work with glob patterns.)

$wild is defined up at the beginning of the function as either positional argument $3 or (if that is empty) an asterisk, which matches anything in glob wildcard notation.
 

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LEARN ABOUT SUSE

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
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1                                                    Sun Jan 8 2012                                                      set_color(1)
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