Language | binary | octal | hexadecimal |
---|---|---|---|
bash | 2#[0~1] | 0[0~7] | 0x[0~f] or 0X[0~f] |
perl | 0b[0~1] | 0[0~7] | 0x[0~f] |
tcl | 0b[0~1] | 0o[0~7] | 0x[0~f] |
bash different base represntation reference
Language | String length |
---|---|
bash | ${#variable_store_string} |
perl | length($variable_store_string) |
tcl | string length variable_store_string |
bash string length reference
perl string length reference
https://www.tutorialspoint.com/tcl-tk/tcl_strings.htm
Language | String upper | String lower |
---|---|---|
bash | ${variable_store_string^^} | ${variable_store_string,,} |
perl | uc($variable_store_string) | lc($variable_store_string) |
tcl | string toupper variable_store_string | string tolower variable_store_string |
# perl \u 修改下一个字符为大写 \l 修改下一个字符小写 \U 修改后面所有字符大写 \L 修改后面所有字符小写 \Q 使后面的所有字符都成为字面符号 \E 结束\U \L或\Q的效果 # =============================================================== # perl bash tcl ucfirst ${var^} string toupper 0/string totitle lcfirst ${var,} string tolower 0
# bash declare -l var="strings" declare -u var="strings"
bash upper/lower blog reference
declare command reference
tr command reference