portable commands (Score 1)

While some people like grep -r, xargs -0, etc. -- I deal with many UNIX variants, so I need a portable subset. Hence:

# Daemonize a process
nohup sh -c 'command > /dev/null 2>&1 </dev/null & ' > /dev/null 2>&1 </dev/null &
# Convert a file to LF from CR/LF
tr -d '\015' < foo.txt > bar.txt
# Scripted editing of a file when you don't need something as complex as awk/sed
# (or they have odd problems/limitations on that platform):
$ ed foo.c <<__EOL__
1 /stdio.H
s/stdio.H/stdio.h/
w
q
__EOL__
# Recall history and edit it as a text file, then run it in the shell.
# Defaults to /bin/ed on many Bourne-shell variants unless you set FCEDIT.
# Useful to repeat a long sequence of actions taken while you were trying to
# figure out how to do stuff.
FCEDIT=${VISUAL:-/usr/bin/vi} export FCEDIT
fc
# Useful for annotating stuff when commenting on a file -- numbers them:
nl file.txt
# Easy way to check for a byte occuring in a file -- handy in certain types
# of input validation and forensics.
od -t x1 file.txt | grep 'a9'
# And something Debian/bash-specific. You figure it out. :-)
MAX_NR=0 ; varry=(`deborphan -an|awk '{print $2}'|sort|tr '\012' ' '`) ; i=${#varry[@]}; while [ $i -gt 0 ] ; do NR=`echo ${varry[$((i-1))]}|wc -c` ; if [ $NR -gt $MAX_NR ] ; then MAX_NR=$NR ; fi ; i=$(($i-1)) ; done ; NR_PER_LINE=$(( $((COLUMNS-1)) / MAX_NR )) ; FSTR="%${MAX_NR}s|" ; while [ $i -lt ${#varry[@]} ] ; do CURCOUNT=0 ; echo -n '|' ; while [ $CURCOUNT -lt $NR_PER_LINE ] ; do printf "${FSTR}" ${varry[$i]} ; i=$(($i+1)) ; CURCOUNT=$(($CURCOUNT+1)) ; done ; echo ; done|less