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size_t strlen(const char *str)
int strcmp(const char *str1, const char *str2) int strncmp(const char *str1, const char *str2, size_t n)
strlen
strcmp
strncmp
cat
echo "Hello world" | cat
Hello world
echo "Hello world" | cat2
world
\n
\t
echo "Hello world and hello again " | words
Hello world and hello again
echo "Hello world and hello again " | words-len
Hello 5 world 5 and 3 <-- hello 5 again 5
echo "Hello world" | cap
hELLO WORLD
tr
echo "Hello world" | tr 'Hl' 'Xk'
Xekko workd
echo "Hello world" | tr 'dweji' '01234'
H2llo 1orl0
echo "Hello world and hello again " | words | cap
hELLO WORLD AND HELLO AGAIN