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Miscellaneous improvements

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This commit is contained in:
Crestwave
2019-01-19 17:20:13 +08:00
parent 2b558f2962
commit 2414ae9f42
9 changed files with 78 additions and 50 deletions
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16
manuscript/chapter1.txt
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@@ -100,7 +100,7 @@ $ regex "red" '^(#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3}))$'
```shell
is_hex_color() {
if [[ "$1" =~ ^(#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3}))$ ]]; then
if [[ $1 =~ ^(#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3}))$ ]]; then
printf '%s\n' "${BASH_REMATCH[1]}"
else
printf '%s\n' "error: $1 is an invalid color."
@@ -313,17 +313,17 @@ The Quick Brown
**Using a test:**
```shell
if [[ "$var" == *sub_string* ]]; then
if [[ $var == *sub_string* ]]; then
printf '%s\n' "sub_string is in var."
fi
# Inverse (substring not in string).
if [[ "$var" != *sub_string* ]]; then
if [[ $var != *sub_string* ]]; then
printf '%s\n' "sub_string is not in var."
fi
# This works for arrays too!
if [[ "${arr[*]}" == *sub_string* ]]; then
if [[ ${arr[*]} == *sub_string* ]]; then
printf '%s\n' "sub_string is in array."
fi
```
@@ -349,12 +349,12 @@ esac
## Check if string starts with sub-string
```shell
if [[ "$var" == sub_string* ]]; then
if [[ $var == sub_string* ]]; then
printf '%s\n' "var starts with sub_string."
fi
# Inverse (var does not start with sub_string).
if [[ "$var" != sub_string* ]]; then
if [[ $var != sub_string* ]]; then
printf '%s\n' "var does not start with sub_string."
fi
```
@@ -362,12 +362,12 @@ fi
## Check if string ends with sub-string
```shell
if [[ "$var" == *sub_string ]]; then
if [[ $var == *sub_string ]]; then
printf '%s\n' "var ends with sub_string."
fi
# Inverse (var does not end with sub_string).
if [[ "$var" != *sub_string ]]; then
if [[ $var != *sub_string ]]; then
printf '%s\n' "var does not end with sub_string."
fi
```