Linux commands

(Last Updated On: 02/22/2017)

These are commands I find useful..

get a list of all installed updates

rpm -qa --qf '%{INSTALLTIME} %-40{NAME} %{INSTALLTIME:date}\n' | sort -n

get all CVE’s from all packages

for pkg in `rpm -qa` ; do rpm -q --changelog ${pkg} | grep -i cve ; done

find certain files and move them to a directory

find /which/folder -iname "*.txt" -exec mv {} /path/to/folder \;

find certain files and get the size

find . -iname "*.iso" -exec du -hs {} \;

find files that are less then x days old and print the size

find . -name "*.log" -mtime -5 -exec du -hs {} \;|sort -n

burn a iso to a cd/dvd

wodim dev=/dev/scd0 -v -tao filename.iso

extract a single file from a tar archive

tar --extract --file=/locate/your/file.tar specify_filename.extension

change default editor for launching crontab

env EDITOR=vi crontab -e

check when a filesystem was created. useful to check when the system was built

tune2fs -l /dev/sda1 | grep created

register a server on redhat’s rhn

rhnreg_ks --profilename "servername" --username "username" --password "password"

killing a process with the same name

kill -9 `ps -ef |grep OpC | grep -v grep | awk '{print $2}'`

check what bit level red hat is at

getconf LONG_BIT

get the serial number from APC pdu’s

snmpwalk -v1 -c private pb01.local.domain iso. | cut -d ":" -f10|cut -d " " -f2

grep multiple strings and sort on column

grep -E '(^mic)|(livelink)' * | sort -n -k4

delete files older than 3 days

find . -type f -mtime +3 -exec rm {} \;

downgrade a package in RedHat

rpm -Uvh --oldpackage --nodeps rpm-

run the du command in the current directory and sort on the second field specifying folder depth

du -h --max-depth=1 |sort -k2

check how long a process has been running for

ps -p PID -o etime=

read inside of a gz file

gzip -cd vmkernel.2.gz | less

list latest installed updates

rpm -qa --qf '%{INSTALLTIME} %-40{NAME} %{INSTALLTIME:date}\n' | sort -n | cut -d' ' -f2-


rpm -qa --last

find and replace string in multiple files

grep -rl matchstring somedir/ | xargs sed -i 's/string1/string2/g'

copy files but ignore existing to a remote server

rsync *.jpg -v -e ssh --ignore-existing <username>

rename all files to lowercase characters

for f in *; do mv "$f" "`echo $f | tr "[:upper:]" "[:lower:]"`"; done

Users using more then 1% memory

ps aux | awk '$1 != "USER" {t[$1]+=$4} END {for (i in t) {print t[i]" "i}}' | sort –n | grep -v ^0

Apps using more than 1% memory

ps aux | awk '$1 != "USER" {t[$11]+=$4} END {for (i in t) {print t[i]" "i}}' | sort –n | grep -v ^0

export postgres database

/usr/local/PostgreSQL/9.0/bin/pg_dump -U postgres dsvdbase -N topology -T spatial_ref_sys > dbexport.pgsql

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