How to really loop over filenames with spaces in

 Don't parse the output of "ls".

Instead:

for file in *

do

  ...

done

(source)

Ctrl-C doesn't interrupt loop in Bash script

If you want Ctrl-C to be able to stop your loop in Bash, put this inside the loop:

trap "echo Exited!; exit;" SIGINT SIGTERM

(source)

For-each over static values in XSL

When you want to do this:

<xsl:for-each select="$some_value in ('a','b','c','d')"><!-- invalid? -->

You have to do this:

<xsl:variable name="items">
    <item>a</item>
    <item>b</item>
    <item>c</item>
    <item>d</item>
</xsl:variable>

<xsl:for-each select="$items/item">
    <xsl:choose>
    <xsl:when test="$some_value = .">

Bash: How to loop through a list of terms containing spaces

Change the Internal Field Separator (IFS):

O=$IFS
IFS=$(echo -en "\n\b")
for f in $(ls *)
do
echo "$f"
done
IFS=$O

Pass in an extra parameter to perl -n

Use an environment variable

for k in $(cat list_of_ids); do export KK=$k; perl -F"\t" -lane'print if ($F[3] eq $ENV{KK})' data/master_list_of_queries >> new_data_file; done