--- /dev/null
+#!/bin/bash
+
+#
+# these great examples of handy unix tidbits were donated by "q. black".
+#
+
+# list a directory tree
+ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/'
+
+# list directory sizes (biggest first)
+du -h $(du -s * |sort -nr|awk '{print $2}')
+
+# this will sort a date field of the form: DD-MON-YYYY HH:MM:SS
+sort +0.7 -1 +0.3M -0.6 +0 -0.2 +1
+
+# this will sort a date field of the form: MON DD HH:MM:SS YYYY
+sort +3 -4 +0M +1n
+
+# this will sort a date field of the form: MON DD HH:MM:SS
+sort +0M +1n
+
+# this will sort a date field of the form: Date: Tue Feb 3 09:17:58 EST 2004
+sort +6 -7 +2M +3n +4
+
+# display all lines from a certain line onward
+start_line=132
+|awk "{if (NR >= ${start_line}){print \$0}}"
+
+# display all lines after a token
+sed '1,/CUT HERE/d'
+
+# print the first and last lines
+sed -n '1,1p;$,$p'
+
+# signal bash about a window size change
+kill -winch $$
+
+# show the date 1 year, 2 months and 3 days ago
+date -v -1y -v -2m -v -3d
+
+# set the date back 1 year
+sudo date $(date -v -1y +%Y%m%d%H%M)
+
+# output the standard date format for setting the time
+# get the date
+date -u +%Y%m%d%H%M.%S
+# set the date
+date -u (cut and paste from above)
+
+# convert one date format to another (output is in the current time zone)
+old_date="Aug 27 15:24:33 2005 GMT"
+new_date=$(date -j -f "%b %e %T %Y %Z" "${old_date}" +%D)
+echo ${new_date}
+# returns "08/27/05"
+
+# output the modification time of a file in different format
+file=
+date -j -f "%b %e %T %Y" "$(ls -lT ${file} |awk '{print $6,$7,$8,$9}')"
+
+# output the number of days until a certain date
+target_date="Sep 2 15:20:20 2005 GMT"
+target_seconds=$(date -j -f "%b %e %T %Y" +%s "${target_date}" 2>/dev/null)
+diff_seconds=$(expr ${target_seconds} - $(date +%s))
+diff_days=$(expr ${diff_seconds} / 86400)
+echo "${diff_days} day(s)"
+
+# these commands can be used to fill in missing times in a "uniq -c" count
+# of times.
+# output 24 hours in one minute increments
+for h in $(jot -w %02d - 0 23 1); do
+ for m in $(jot -w %02d - 0 59 1); do
+ echo " 0 ${h}:${m}"
+ done
+done
+# sort them together, and remove any 0 counts if an count already exists
+sort +1 +0rn out1 out2 |uniq -f 1
+
+# output with w3m to get basic html word wrap
+w3m -T "text/html" -dump -cols 72 <<EOF
+ <p>
+ This test verifies basic networking and that the ${product_short_name}
+ can reach it's default gateway.
+EOF
+
+# another way to format text for output
+fmt 72 <<EOF
+This test verifies basic networking and that the ${product_short_name}
+can reach it's default gateway.
+EOF
+
+# smtpcrypt "printf"
+{
+char *jkwbuf = NULL;
+asprintf(&jkwbuf, "JKW: msg->used = %ld\n", msg->used);
+BIO_write(sc->log, jkwbuf, strlen(jkwbuf)+1);
+free(jkwbuf);
+}
+
+# rolling diff of a list of files (diff a & b, then b & c,...)
+last=
+for i in $(ls -1rt); do
+ if [ ! -z "${last}" ]; then
+ diff -u ${last} ${i}
+ fi
+ last=${i}
+done
+
+# clearing and restoring chflags
+file=
+old_chflags=$(ls -lo ${file}|awk '{print $5}')
+chflags 0 ${file}
+# do whatever
+if [ ."${old_chflags}" != ."-" ]; then
+ chflags ${old_chflags} ${file}
+fi
+
+# way to do standard edits to files
+file=
+{
+ # append line(s) after a line, "i" to insert before
+ echo '/www_recovery/a'
+ echo 'mithril ALL = (root) NOPASSWD: /usr/local/libexec/destroyer'
+ echo '.'
+ # modify a line
+ echo 'g/^xntpd_program=/s,^xntpd_program=.*$,xntpd_program="ntpd",'
+ # delete a line
+ echo 'g/^controls key secret =/d'
+ echo 'x!'
+} | ex - ${file}
+
+# how to search for errors in the last 24 hours
+# note that this command does not work quite right. The sort is off early
+# in the year because the dates do not have the year.
+# Also sed never sees the /CUT HERE/ when it is the first line.
+(echo "$(date -v-24H "+%b %e %H:%M:%S") --CUT HERE--"; \
+ zgrep -h "cookie" /var/log/messages*)|sort +0M| \
+ sed '1,/CUT HERE/d'
+# This version fixes those problems. It adds the file year to the date
+# and puts a marker at the start of the list.
+(echo "$(date -j -f "%s" 0 "+%Y %b %e %H:%M:%S") --ALWAYS FIRST--"; \
+ echo "$(date -v-24H "+%Y %b %e %H:%M:%S") --CUT HERE--"; \
+ for i in /var/log/messages*; do
+ year=$(ls -lT ${i}|awk '{print $9}')
+ zgrep -h "cookie" ${i}|while read line; do
+ echo "${year} ${line}"
+ done
+ done)|sort +0n +1M| sed '1,/CUT HERE/d'
+
+# process a list of quoted values
+{
+ # It tends to be easiest to use a 'here-document' to feed in the list.
+ # I prefer to have the list at the start instead of the end
+ cat <<EOF
+ 'general' 'network node0' 'private address'
+ 'general' 'options node2' 'kern securelevel'
+EOF
+}| while read line; do
+ eval set -- ${line}
+ config=$1; shift
+ section=$1; shift
+ key=$1; shift
+
+ echo "confutil value \"${config}\" \"${section}\" \"${key}\""
+done
+
+# Method to read lines with a "for" loop, without spawning a subshell
+NEWLINE='
+'
+OIFS="${IFS}"
+IFS="${NEWLINE}"
+for line in $(cat /etc/passwd | sort -r); do
+ IFS="${OIFS}"
+
+ # do whatever you want here
+ echo "line = ${line}"
+
+ IFS="${NEWLINE}"
+done
+IFS="${OIFS}"
+
+# generate a histogram of characters in a file
+cat file|
+ awk '{for (i=1; i <= length($0); i++) {printf("%s\n",substr($0,i,1))}}'|
+ sort|uniq -c
+
+# show line lengths for a file
+cat file| awk '{print length($0)}'| sort -n
+
+
+
+
+# get the modification time of a directory or file and then reset the time.
+target=/usr/local/etc/pkdb
+save_date=$(ls -ldT ${target}|awk '{print $6,$7,$8,$9}')
+save_date=$(date -j -f "%b %e %T %Y" "${save_date}" +"%Y%m%d%H%M.%S")
+# later
+touch -t ${save_date} ${target}
+
+
+# detect NULL bytes in a file
+file=
+hexdump -e '"%_u\n"' ${file}|grep -q '^nul$'
+if [ $? -eq 0 ]; then
+else
+fi
+
+
+# calculate average
+cd /tmp
+uudecode
+begin 644 bc.average
+M<V-A;&4],PIT;W1A;#TP"F-O=6YT/3`*=VAI;&4@*#$I('L*("`@(&YU;2`]
+M(')E860H*0H@("`@:68@*&YU;2`]/2`P*2!B<F5A:SL*("`@(&-O=6YT*RL*
+M("`@('1O=&%L("L](&YU;0I]"B)T;W1A;"`]("([('1O=&%L"B)C;W5N="`]
+K("([(&-O=6YT"B)A=F5R86=E(#T@(CL@=&]T86P@+R!C;W5N=`IQ=6ET"@``
+`
+end
+(cat data; echo "0") |bc -q bc.average
+
+
projects / feisty_meow.git / blobdiff