two simple scripts: append & firep

#!/bin/bash
# custom script for appending stuff to filenames
# replaces spaces with underscores as well for posterity
# use 'append [string] [file]' or 'append [string] -d' to
# append to all files in directory

IFS='
'

if [ $# -lt 2 ]; then
    echo "Use 'append [string] [file]' (single file) or 'append [string] -d' (all files in directory)."
    exit 1
fi
if [ $2 == "-d" ]; then
    for i in *; do
       FILE=("${FILE[@]}" "$i")
    done
else
    if [ -e $2 ]; then
        FILE=("${FILE[@]}" "$2")
    else
        echo "$2: No such file here."
        exit 1
    fi
fi
for ((x=0; x<${#FILE[*]}; x++)); do
   curr=${FILE[x]}
    mv -v "$curr" `echo $1$curr`
done
exit 0

#!/bin/bash
# firep - a find-and-replace script
# use 'firep [find_string] [replace_string] [file]' or
# 'firep [find_string] [replace_string] -d' to
# find-and-replace on all files in directory

IFS='
'

if [ $# -lt 3 ]; then
    echo "Use 'firep [find_string] [replace_string] [file]' (single file) or 'firep [find_string] [replace_string] -d' (all files in directory)."
    exit 1
fi
if [ $3 == "-d" ]; then
    for i in *; do
       FILE=("${FILE[@]}" "$i")
    done
else
    if [ -e $3 ]; then
        FILE=("${FILE[@]}" "$3")
    else
        echo "$3: No such file here."
        exit 1
    fi
fi
for ((x=0; x<${#FILE[*]}; x++)); do
   curr=${FILE[x]}
   firep=$(sed "s/$1/$2/" <<< $curr)   
   mv -v -- "$curr" $(echo $firep)
done
exit 0