Check These Out
This should be an option to rpm, but isn't. I wind up using it a lot because I always forget the full name of the packages I want to delete.
This command will list all threads started by a particular pid along with the start time of each thread. This is very valuable when diagnosing thread leaks.
Installs pip packages defining a proxy
Converts any number of seconds into days, hours, minutes and seconds.
sec2dhms() {
declare -i SS="$1"
D=$(( SS / 86400 ))
H=$(( SS % 86400 / 3600 ))
M=$(( SS % 3600 / 60 ))
S=$(( SS % 60 ))
[ "$D" -gt 0 ] && echo -n "${D}:"
[ "$H" -gt 0 ] && printf "%02g:" "$H"
printf "%02g:%02g\n" "$M" "$S"
}
Might as well include the status code it exited with so you know right away if it failed or not.
Sorts a character string, using common shell commands.
This is useful for example if you are on ssh in a server and the server goes down without letting you out.
This is part of a larget sets of escape sequences provided by ssh. You can find them with ~? Here's the list:
~. - terminate connection (and any multiplexed sessions)
~B - send a BREAK to the remote system
~C - open a command line
~R - request rekey
~V/v - decrease/increase verbosity (LogLevel)
~^Z - suspend ssh
~# - list forwarded connections
~& - background ssh (when waiting for connections to terminate)
~? - this message
~~ - send the escape character by typing it twice
(Note that escapes are only recognized immediately after newline.)
A common mistake in Bash is to write command-line where there's command a reading a file and whose result is redirected to that file.
It can be easily avoided because of :
1) warnings "-bash: file.txt: cannot overwrite existing file"
2) options (often "-i") that let the command directly modify the file
but I like to have that small function that does the trick by waiting for the first command to end before trying to write into the file.
Lots of things could probably done in a better way, if you know one...