( kroozo | 2023. 04. 13., cs – 13:15 )

[kroozo@superior tmp]$ cat t1.sh 
#!/bin/bash

for i in $(seq -w 5 10); do echo $i; if [ ${i} -gt 6 ] ; then echo nagyobb; fi; done
[kroozo@superior tmp]$ ./t1.sh 
05
06
07
nagyobb
08
nagyobb
09
nagyobb
10
nagyobb
[kroozo@superior tmp]$ cat t2.sh 
#!/bin/bash

for i in $(seq -w 5 10); do echo $((i)); if [ ${i} -gt 6 ] ; then echo nagyobb; fi; done
[kroozo@superior tmp]$ ./t2.sh 
5
6
7
nagyobb
./t2.sh: line 3: 08: value too great for base (error token is "08")
[kroozo@superior tmp]$ bash --version
GNU bash, version 5.2.15(1)-release (x86_64-redhat-linux-gnu)