Pure Bash Bible File Handling
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Pure Bash Bible - File Handling
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Read a file to a string
Alternative to the cat command
Function
$ filedata="$(<"file")"
Example
$ cat update.sh
git add .
git status
git commit -m "content update"
git push
$ file_data="$(<"update.sh")"
$ echo "${file_data}"
git add . git status git commit -m "content update" git push
Read a file to an array (by line)
Function
# Bash <4 (discarding empty lines)
IFS=$'\n' read -d "" -ra file_data < "file"
# Bash <4 (preserving empty lines)
while read -r line; do
file_data+=("$line")
done < "file"
# Bash 4+
mapfile -t file_data < "file"
# or
readarray -t file_data < "file"
Example
$ cat update.sh
git add .
git status
git commit -m "content update"
git push
$ mapfile -t file_data < "update.sh"
$ echo "${file_data[@]}"
git add . git status git commit -m "content update" git push
$ for i in "${file_data[@]}"; do echo $i; done
git add .
git status
git commit -m "content update"
git push