linux - BASH - how can i get the variable value inside the EOF tags? -


i have following script need $i variable value working inside each block starting eof , ending eof.

its not reading variable value putting $i

/var/tmp/vpn.sh have:

#!/bin/bash amazoneth0="10.0.0.18" amazonwan0="4.9.2.9" vpnserver="4.8.8.6" hosttohost1="10.109.0.20/32" hosttohost2="10.109.0.21/32" hosttohost3="10.109.58.6/32" hosttohost4="10.109.59.3/32"  in 1 2 3 4 cat > /tmp/test$i.conf << \eof #step 3 conn test"$i"     #auto=start     type=tunnel     authby=secret     pfs=no     aggrmode=no     ikelifetime=28800s     lifetime=3600s     ike=aes128-md5;modp1024!     phase2alg=aes128-md5;modp1024     forceencaps=yes     left=$amazonlan0     leftid=$amazonwan0     leftsourceip=$amazonwan0     right=$vpnserver     rightsubnet=$hosttohost$i eof done  ### run me cat > /var/tmp/vpn.sh << \eof service ipsec restart  ######## apply loop here, instead of many many lines ########### # in 1 2 3 4 # #   ipsec auto --add test$i # done ipsec auto --add test1 ipsec auto --add test2 ipsec auto --add test3 ipsec auto --add test4  ######## apply loop here, instead of many many lines ########### # in 1 2 3 4 # #   ipsec auto --up test$i # done ipsec auto --up test1 ipsec auto --up test2 ipsec auto --up test3 ipsec auto --up test4  ipsec auto --status ip xfrm policy ip route show  ######## apply loop here, instead of many many lines ########### # in 1 2 3 4 # #   ping -c 1 $hosttohost$i # done ping -c 1 10.109.0.20;  ping -c 1 10.109.0.21; ping -c 1 10.109.58.6;  ping -c 1 10.109.59.3;   eof chmod +x /var/tmp/vpn.sh  # cake - eat - optional  /var/tmp/vpn.sh > save output | mail -s ipsec date time &

remove backslash before eof:

#!/bin/bash  i=ok  # prints "bwah ok" cat <<eof bwah $i eof  # prints "bwah $i" cat <<\eof bwah $i eof

to last line display rightsubnet="10.109.0.20/32" (for i=1), need this:

i=1 val1=beep val2=bop  rightval="val$i" cat <<eof beep: ${!rightval} eof

that is, compute name of variable want, put in variable, , use ${!var} syntax.

but kind of thing should rather use array:

i=0 vals=(beep bop)  cat <<eof beep: ${vals[$i]} eof

note indexes start @ 0.


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