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FIX: read strips leading & trailing IFS whitespace

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Tom Davis 2019-09-28 12:23:15 -04:00
parent bb10d3173c
commit 601d4955f9
1 changed files with 7 additions and 0 deletions
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7
README.md
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@ -410,11 +410,16 @@ Alternative to the `head` command.
```sh ```sh
head() { head() {
# Usage: head "n" "file" # Usage: head "n" "file"
OLDIFS="$IFS"
# `read` strips leading and trailing spaces, tabs, and newlines
# if IFS contains any of them, so clear out IFS
IFS=
while read -r line; do while read -r line; do
printf '%s\n' "$line" printf '%s\n' "$line"
i=$((i+1)) i=$((i+1))
[ "$i" = "$1" ] && return [ "$i" = "$1" ] && return
done < "$2" done < "$2"
IFS="$OLDIFS"
# 'read' used in a loop will skip over # 'read' used in a loop will skip over
# the last line of a file if it does not contain # the last line of a file if it does not contain
@ -647,9 +652,11 @@ done
## Loop over the contents of a file ## Loop over the contents of a file
```shell ```shell
OLDIFS="$IFS"; IFS=
while read -r line || [ -n "$line" ]; do while read -r line || [ -n "$line" ]; do
printf '%s\n' "$line" printf '%s\n' "$line"
done < "file" done < "file"
IFS="$OLDIFS"
``` ```
## Loop over files and directories ## Loop over files and directories