Irm - Inverse rm

sweiss · 2006-10-07 13:30:52

This is a script I wrote, which clears the current working folder, apart from the files listed as parameters.

e.g.:

[sweiss@raviv2 gambas]$ ls
filelist  gambas-1.0.14-1.pkg.tar.gz  gambas-1.0.14.tar.bz2  pkg  PKGBUILD  src
[sweiss@raviv2 gambas]$ irm PKGBUILD gambas-1.0.14-1.pkg.tar.gz
[sweiss@raviv2 gambas]$ ls
gambas-1.0.14-1.pkg.tar.gz  PKGBUILD

I thought I'd share it with you.
Important: This script is written in BASH, and I am not at all an expert. It also does not yet handle files/directories inside subdirectories - If you try doing `irm ./src/file`, the script will quit with an error message and do nothing.
Also, it may be inefficient - If it is, please let me know how to correct it. I suggest reviewing the code in the script before running it - it's not much.

Anyway, here it is:

#!/bin/sh

LS=$(which ls)
WC=$(which wc)
FIND=$(which find)
GREP=$(which grep)
RM=$(which rm)
SED=$(which sed)
AWK=$(which awk)
FILENAME=
GREP_COMMAND=

# Removes any leading 
prep_filename()
{
  if ! [ -n "$1" ]
  then
    return
  fi
  
  FILENAME="$1"
  
  if [ $(echo "$FILENAME" | cut -c1-2) = "./" ]
  then
    FILENAME=$(echo "$FILENAME" | cut -c3-)
    prep_filename "$FILENAME"
  fi
  
  if [ $(echo "$FILENAME" | rev | cut -c1) = "/" ]
  then
    FILENAME=$(echo "$FILENAME" | rev | cut -c2- | rev)
    prep_filename "$FILENAME"
  fi
}

IS_FIRST_FILE=1
for i in $(seq 1 $#)
do
  filename=${!i}
  if ! [ -e "$filename" ]
  then
    echo "No such file or directory: ${filename}"
    exit 1
  fi
  
  prep_filename "$filename"
  
  if [ $(echo "$FILENAME" | sed 's:/::g') != "$FILENAME" ]
  then
    echo irm does not yet support keeping directories/files inside subdirectories. Aborted.
    exit 1
  fi
  
  if [ $IS_FIRST_FILE -eq 1 ]
  then
    GREP_COMMAND=${GREP_COMMAND}"$GREP -vx "$FILENAME""
    IS_FIRST_FILE=0
  else
    GREP_COMMAND=${GREP_COMMAND}" | $GREP -vx "$FILENAME""
  fi
done

# The icky sed part is for escaping the  characters, if such exist.
FILES_TO_REMOVE=$(echo $(eval "$LS -1 -A . | ${GREP_COMMAND} | $SED 's:"'\'":"'\\'":g' | $AWK '{print "\""$0"\""}'"))

if ! [ -n "$FILES_TO_REMOVE" ]
then
  echo No files removed.
  exit 1
fi

eval "$RM -rf $FILES_TO_REMOVE"

Enjoy.

lucke · 2006-10-07 13:54:24

Incidentally, zsh has something like that built in.

You just use "rm ^foobar" (or "rm ^(foo1|foo2)") and it erases everything except that. And it's not limited to rm.

codemac · 2006-10-07 23:24:14

o/ zsh.

remember you have to had extended globbing turned on for that to work if I remember.

shadowhand · 2006-10-09 07:23:57

lucke wrote:

Incidentally, zsh has something like that built in.
You just use "rm ^foobar" (or "rm ^(foo1|foo2)") and it erases everything except that. And it's not limited to rm.

Awesome. Thanks for the tip. zsh++ 8)

lucke · 2006-10-09 07:47:13

shadowhand wrote:

Awesome. Thanks for the tip. zsh++ 8)

Another great feature of zsh (which you're perhaps not familiar with) is "**", which navigates through all the subdirectories - for one, it's more handy than find when searching for filenames ;-)

% ls /lib/modules/2.6.18-ARCH/**/*nvidia*                                                        
/lib/modules/2.6.18-ARCH/kernel/drivers/char/agp/nvidia-agp.ko  /lib/modules/2.6.18-ARCH/kernel/drivers/video/nvidia.ko

Sorry for hijacking the thread, sweiss. Couldn't resist sharing with my favourite features.

sweiss · 2006-10-10 21:04:39

Not a problem at all. Perhaps I should too take the plunge and start using ZSH.

Does it have any noticeable drawbacks?

lucke · 2006-10-10 21:17:51

The only drawback is that it takes some time and effort to discover all the (great) features ;-)

headhunter · 2006-10-13 17:57:54

Yeah, ZSH is really great if you have the right configuration for it. Takes some time to setup, but once you're used to it you'll never want to use a bash again

phrakture · 2006-10-13 20:43:30

Gonna hijack a bit:

lucke wrote:

% ls /lib/modules/2.6.18-ARCH/**/*nvidia*                                                        
/lib/modules/2.6.18-ARCH/kernel/drivers/char/agp/nvidia-agp.ko  /lib/modules/2.6.18-ARCH/kernel/drivers/video/nvidia.ko

While this is a cool feature, the unintuitiveness and non-portability bothers me...

find /lib/modules/2.6.18-ARCH -name *nvidia*

works everywhere and gives you more options.... I mean, for example:

find /lib/modules/2.6.18-ARCH -iname *nvidia* -delete

iname is case-insensitive and -delete deletes them - try doing that with shell features (zsh OR bash) and it's a PITA

lucke · 2006-10-13 21:05:22

phrakture wrote:

try doing that with shell features (zsh OR bash) and it's a PITA

setopt nocaseglob
rm /lib/modules/2.6.18-ARCH/**/*nvidia*

I dare say that once nocaseglob is set, it's even more simple/intuitive than find. To each it's own. Find is indeed a great and powerful tool, but zsh has its advantages too - ability to use globbing for _any_ CLI operation (ls, rm, grep et al.) is obviously a nice thing. And it allows to distunguish files with different rights/directories/symlinks as well, bringing it even closer to find's abilities. But actually - they're quite complementary.

Yay for choice!

Arch Linux

#1 2006-10-07 13:30:52

Irm - Inverse rm

#2 2006-10-07 13:54:24

Re: Irm - Inverse rm

#3 2006-10-07 23:24:14

Re: Irm - Inverse rm

#4 2006-10-09 07:23:57

Re: Irm - Inverse rm

#5 2006-10-09 07:47:13

Re: Irm - Inverse rm

#6 2006-10-10 21:04:39

Re: Irm - Inverse rm

#7 2006-10-10 21:17:51

Re: Irm - Inverse rm

#8 2006-10-13 17:57:54

Re: Irm - Inverse rm

#9 2006-10-13 20:43:30

Re: Irm - Inverse rm

#10 2006-10-13 21:05:22

Re: Irm - Inverse rm

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