Category: unix

in OS, programming, shell, ubuntu, unix

less +F $(date “+/var/logs/vmware_%F.log”)

Unix – disk and file size monitoring with du, df and stat

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in OS, programming, shell, ubuntu, unix

du – file space usage GB sized files and directories du -xh DIRPATH |egrep “^[0-9\.]+[GT]\s” # Examples du -xh ~/ |egrep “^[0-9\.]+[GT]\s” sudo du -xh / |egrep “^[0-9\.]+[GT]\s” Size Of Directory and Disk Space du -s .archived/ du –sk # k: output in in KB # x=> expands, only on the local file system –…

Linux – IO Wait Monitoring – Top, IOStat and WMStat

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1. Top top -c column wa => io wait 2. IOStat Installation sudo apt-get install -y sysstat iostat -k 3 IO History ls /var/log/sysstat/sa[0-9]* Select a File, e.g. sar -u -f /var/log/sysstat/sa17 3. VMStat vmstat 5 120 Help: vmstat –help Usage: vmstat [options] [delay [count]] Options: -a, –active active/inactive memory -f, –forks number of forks…

Unix – Executing Top once or Every X Seconds

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Top Every Second -Version 1 top -c -b Top Every Second -Version 2 top -c -b -d 1 Top Every 5 Seconds top -c -b -d 5 Top Only once top -c -b -n 1 top -h procps-ng version 3.3.3 usage: top -hv | -bcHiSs -d delay -n limit -u|U user | -p pid[,pid] -w…

Unix – Show, Create and Delete Command Alias

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in programming, shell, unix

Define an Alias The first example causes ls -l to be executed when the command ll is entered: alias ll ls -l Show all defined Alias alias Show Alias for specific Alias alias ls Alias File – .bash_aliases The alias file located in ~/.bash_aliases is executed on startup. Below is an example of .bash_aliases. cat…

Postgres – Which users are Currently Connected to the database

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Postgres Database – Who is Currently Connected SELECT * FROM pg_stat_activity order by client_addr;

Unix – ps – finding running processes

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ps -fA|grep postgres PS(1) User Commands PS(1) NAME ps – report a snapshot of the current processes. SYNOPSIS ps [options] DESCRIPTION ps displays information about a selection of the active processes. If you want a repetitive update of the selection and the displayed information, use top(1) instead. This version of ps accepts several kinds of…

Unix – using tail and grep together

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Tail Examples tail -f postgres.log|grep “exec” | awk ‘{print $1,$16,$7}’ Tail Examples tail -f /var/log/postgresql.log | egrep “errors” tail –help Usage: tail [OPTION]… [FILE]… Print the last 10 lines of each FILE to standard output. With more than one FILE, precede each with a header giving the file name. With no FILE, or when FILE…

Unix – Find the Files open by a process

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Files Open by Process ls -l /proc/PROCID/fd Count Files Open by Process lsof -p PROCID|wc -l #alternative ls -l /proc/PROCID/fd| wc -l lsof -h lsof 4.86 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/ latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-f[gG]] [+|-e s] [-F [f]] [-g [s]] [-i [i]] [+|-L [l]]…

Unix – Kill Processes

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