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Wyświetlanie wybranych linii
FILE="/home/chris/tekst.txt"
LINIA_POCZATKOWA=4
LINIA_KONCOWA=2
pi@chris:~ $ CAT $FILE
1
2
3
4
5
pi@chris:~ $ CAT $FILE | HEAD -$LINIA_POCZATKOWA | TAIL -$LINIA_KONCOWA
# head - bierze linie od poczatku
# tail - bierze linie od koncaOPTIONS
set -o noclobber # Avoid overlay files (echo "hi" > foo)
set -o errexit # Used to exit upon error, avoiding cascading errors
set -o pipefail # Unveils hidden failures
set -o nounset # Exposes unset variablesConditionals
[[ -z STRING ]] | Empty string |
[[ -n STRING ]] | Not empty string |
[[ STRING == STRING ]] | Equal |
[[ STRING != STRING ]] | Not Equal |
[[ NUM -eq NUM ]] | Equal |
[[ NUM -ne NUM ]] | Not equal |
[[ NUM -lt NUM ]] | Less than |
[[ NUM -le NUM ]] | Less than or equal |
[[ NUM -gt NUM ]] | Greater than |
[[ NUM -ge NUM ]] | Greater than or equal |
[[ STRING =~ STRING ]] | Regexp |
(( NUM < NUM )) | Numeric condition |
File conditions
[[ -e FILE ]] | Exists |
[[ -r FILE ]] | Readable |
[[ -h FILE ]] | Symlink |
[[ -d FILE ]] | Directory |
[[ -w FILE ]] | Writable |
[[ -s FILE ]] | Size is > 0 bytes |
[[ -f FILE ]] | File |
[[ -x FILE ]] | Executable |
[[ FILE1 -nt FILE2 ]] | 1 is more recent than 2 |
[[ FILE1 -ot FILE2 ]] | 2 is more recent than 1 |
[[ FILE1 -ef FILE2 ]] | Same files |
Arrays
Fruits=('Apple' 'Banana' 'Orange')
Fruits[0]="Apple"
Fruits[1]="Banana"
Fruits[2]="Orange"
echo ${Fruits[0]} # Element #0
echo ${Fruits[-1]} # Last element
echo ${Fruits[@]} # All elements, space-separated
echo ${#Fruits[@]} # Number of elements
echo ${#Fruits} # String length of the 1st element
echo ${#Fruits[3]} # String length of the Nth element
echo ${Fruits[@]:3:2} # Range (from position 3, length 2)
echo ${!Fruits[@]} # Keys of all elements, space-separated
for i in "${arrayName[@]}"; do
echo $i
done
Cześć Podróżniku!
Ta strona ma nie być typowym poradnikiem w IT, Głównym jej cel to zapisanie krótkich notatek, które mogą się przydać w codziennym życiu podczas korzystania/konfiguracji różnych urządzeń np. Ustawienia DHCP na Routerze Cisco, Ustawieniu Karty sieciowej na Linuxie itp.
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