Vlákno názorů k článku
Stejné příkazy na více serverech pomocí gsh od BlackRider - Nechapu k cemu tyhle "nastroje" sou. To samy...

Nechapu k cemu tyhle "nastroje" sou. To samy si v bashi kazdej admin napise na par radku a pokud ne, tak nema co na ty servery vubec co sahat.

Aby to nemusel psat a hlavne udrzovat?

Ja potrebujem robit update na X-terminaloch v ucebni, ktora nesmie mat svoje DHCP ale az DHCP Ustavu. DHCP ustavu nemam k dispozicii. A na update staci skriptik a jedine, co mi gsh da je mozno paralelizmus v ramci umyslene urobenych troch faz.

skript

#!/bin/bash
IPCKY=$(netstat -a|egrep x11|sort -u -k5|awk '{print $5}' |sed 's/:x11-2//')

PRIKAZ="yes yes |apt-get update"
for IP in $IPCKY;
do
echo "refresh repositories of:" $IP
ssh -i ./my-id_rsa root@$IP $PRIKAZ;
done

PRIKAZ="yes yes|apt-get upgrade"
for IP in $IPCKY;
do
echo "update of:" $IP
ssh -i ./my-id_rsa root@$IP $PRIKAZ;
done

PRIKAZ="reboot"
for IP in $IPCKY;
do
echo "reboot of:" $IP
ssh -i ./my-id_rsa root@$IP $PRIKAZ;
done

Co chces udrzovat na trech radcich? Hlavne to napises jednou a funguje to vsude. Nemusis nikde instalovat nakej ultra mega program, kterej dela to samy co ty tri radky v Bashi...

zeby to bolo az tak tazke si nemyslim

man 1p wiat
"
sleep 1000&
pid=$!
kill −kill $pid
wait $pid
"

ci. z
http://stackoverflow.com/questions/356100/how-to-wait-in-bash-for-several-subprocesses-to-finish-and-return-exit-code-0

resp. z
http://stackoverflow.com/questions/356100/how-to-wait-in-bash-for-several-subprocesses-to-finish-and-return-exit-code-0

#!/bin/bash
for i in `seq 0 9`; do
doCalculations $i &
done
wait

The above script will wait for all 10 spawned subprocesses, but it will always give exit status 0

wait also (optionally) takes the PID of the process to wait for, and with $! you get the PID of the last command launched in background. Modify the loop to store the PID of each spawned sub-process into an array, and then loop again waiting on each PID.

A na toto mame += v cykle

Takze ono to tak zlozite nie je. Samozrejem IPC v shellio asi nebude, neskumal som

Za prve paralelne spoustet vic prikazu je fakt jednoduchy.
A za druhy pro vetsinu pripadu staci i blbej for cyklus.