Differences

This shows you the differences between two versions of the page.

--- tips:threelinestip [2008/09/22 17:38]
a
+++ tips:threelinestip [2008/12/09 17:23]
a + Local/remote webserver
@@ Line 65: / Line 65: @@
    # strings `which sshd` | grep -i libwrap
+===== Comparing files & taking some action based on outcome =====
+**Method 1**
+<code>
+cmp -s file1 file2 || {
+  # do something
+}
+</code>
+**Method 2**
+<code>
+cmp -s file1 file2
+if [ $? = 1 ]
+then
+  # do something
+fi
+</code>
+===== IPv4 parsing / sorting =====
+   egrep '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}'
+and
+   sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4
+===== finding a string in a "live" stream =====
+tail -f filename |grep --line-buffered  STRING
+===== Local/remote webserver =====
+Serve files on port 8080 for anybody from the directory from where you start this command:
+<code bash|>
+:;while [ $? -eq 0 ];do nc -vlp 8080 -c'(r=read;e=echo;$r a b c;z=$r;while [ ${#z} -gt 2 ];do $r z;done;f=`$e $b|sed 's/[^a-z0-9_.-]//gi'`;h="HTTP/1.0";o="$h 200 OK\r\n";c="Content";if [ -z $f ];then($e $o;ls|(while $r n;do if [ -f "$n" ]; then $e "<a href=\"/$n\">`ls -gh $n`
+";fi;done););elif [ -f $f ];then $e "$o$c-Type: `file -ib $f`\n$c-Length: `stat -c%s $f`";$e;cat $f;else $e -e "$h 404 Not Found\n\n404\n";fi)';done
+</code>