Initial commit

1 files changed, 21 insertions, 0 deletions

diff --git a/tools/each b/tools/each
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index 0000000..da5ce84
--- /dev/null
+++ b/tools/each
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+#!/bin/sh
+
+if [ -z "$1" ]; then
+    echo "Usage: $0 <command>"
+    echo ""
+    echo "Run the given command for each newline-separated line in stdin (think for-each in many programming languages)."
+    echo 'The iterator variable is called "$ELEM", and the index variable is called "$IDX".'
+    exit 1
+fi
+
+i=0
+while IFS=$'\n' read -r line; do
+    j=0
+    for item in $line; do
+        eval "X${j}='$item'"
+        j=$((j+1))
+    done
+
+    IDX=$i ELEM="$line" eval "$1"
+    i=$((i+1))
+done