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--- shell2 [2020/12/09 08:30] – [Application Memory Usage] dblume
+++ shell2 [2024/10/07 22:00] (current) – dblume
@@ Line 51: / Line 51: @@
 declare -r SCRIPT_NAME=$(basename "$BASH_SOURCE")
-## exit the shell (default status code: 1) after printing the message to stderr
+# exit (default status code: 1) after printing the message to stderr
 die() {
     echo >&2 "$1"
@@ Line 292: / Line 292: @@
 # at 3 in the morning on Mondays, delete files older than 30 days
 3 * * 1 find $HOME/.vim/backup/ -type f -mtime +30 -delete
+</code>
+====== Calculate web server bandwidth ======
+Use ''awk'' to add up a column from Apache logs:
+<code>
+$ sudo cat /var/log/httpd/access_log | awk '{SUM+=$10}END{print SUM/1024/1024}'
+.855597
 </code>
@@ Line 551: / Line 560: @@
   find lib -type f -name \*.so\* -exec sh -c 'objdump -p "$1" | grep "NEEDED.*libz"' - {} \; -print
-Note that you can pass -print (or -and -print) after a -exec argument. Also, the " - " is just a placeholder for $0 (usually the command name, in this case "sh"), we want $1 to be {}. It outputs results like:
+Note that you can pass -print (or -and -print) after a -exec argument. You can also use -printf, ex., ''-printf %%"%%\t%f\n%%"%%''. Also, the " - " is just a placeholder for $0 (usually the command name, in this case "sh"), we want $1 to be {}. It outputs results like:
     NEEDED               libz.so.1
   lib/libprotoc.so.13.0.2
+Tip: tar up the last day's worth of log files:
+  find . -mtime -1 -name \*.log -print0 | tar -jcvf logs.tar.bz2 --null -T -
 ====== Additional Keywords ======
 Linux, Unix, *nix