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Using rename

 
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# 1  
Old 03-22-2014
Using rename
I want to rename files

Files show like this

Code:
1977SSD_rsdtst.pdf
1976SDP_rstdtsr.pdf
1943FDT_rstdsrt.pdf
1996DFF_stdstrd.pdf

I want to introduce _ after the year, and move the characters to the end
to get

Code:
1977_rsdtst_SSD.pdf
1976_rstdtsr_SDP.pdf
1943_rstdsrt_FDT.pdf
1996_stdstrd_DFF.pdf

# 2  
Old 03-22-2014
And what have you tried?
# 3  
Old 03-23-2014
This is purely longhand to show a way of building up each line ready for use.
There are no loops nor the usage of the mv command.
It uses __builtins__ only and is step by step in the code shown/
It is a little tongue-in-cheek but shows the power of the shell.
OSX 10.7.5, default bash terminal.
Code:
#/bin/bash
echo "1977SSD_rsdIUIUYIU2345tst.pdf
1976SDP_rstdtYsr.pdf
1943FDT_rstt.pdf
1996DFF_stdstrd.pdf" > /tmp/text
# Save IFS for later.
ifs_str="$IFS"
IFS="
"
read -d '' -r text < /tmp/text
echo "$text"
# This is purely longhand using builtins; set up an array using newlines only as a separater...
arr=($text)
# First array.
length="${#arr[0]}"
echo "$length"
txt="_${arr[0]:4:3}"
echo "$txt"
rename="${arr[0]:0:4}${arr[0]:7:$[ ( $length - 11 ) ]}$txt${arr[0]:$[ ( $length - 4 ) ]:4}"
echo "$rename"
# Second array.
length="${#arr[1]}"
echo "$length"
txt="_${arr[1]:4:3}"
echo "$txt"
rename="${arr[1]:0:4}${arr[1]:7:$[ ( $length - 11 ) ]}$txt${arr[1]:$[ ( $length - 4 ) ]:4}"
echo "$rename"
# Third array would go here but this IS longhand so now work out any loops to automate it.
# Reset IFS to default...
IFS="$ifs_str"
exit 0

Results...
Code:
Last login: Sun Mar 23 11:23:38 on ttys000
AMIGA:barrywalker~> chmod 755 rename.sh
AMIGA:barrywalker~> ./rename.sh
1977SSD_rsdIUIUYIU2345tst.pdf
1976SDP_rstdtYsr.pdf
1943FDT_rstt.pdf
1996DFF_stdstrd.pdf
29
_SSD
1977_rsdIUIUYIU2345tst_SSD.pdf
20
_SDP
1976_rstdtYsr_SDP.pdf
AMIGA:barrywalker~> _

# 4  
Old 03-23-2014
Code:
for i in $(ls *.pdf)
do
bname="${i%.*}"
ext="${i##*.}"
Y=$(cut -c1-4 <<<${bname})
X=$(cut -f1 -d "_" <<<${bname} | cut -c5-)
Z=$(cut -f2 -d "_" <<<${bname})
j="${Y}_${Z}_${X}.${ext}"
mv ${i} ${j}
done

# 5  
Old 03-23-2014
Ahem...

Quote:
Originally Posted by SriniShoo
Code:
Y=$(cut -c1-4 <<<${bname})
X=$(cut -f1 -d "_" <<<${bname} | cut -c5-)
Z=$(cut -f2 -d "_" <<<${bname})

This might work in bash (i do not know bash all too well), but definitely not in ksh. I don't believe a POSIX-shell would fathom it.

Quote:
Originally Posted by SriniShoo
Code:
for i in $(ls *.pdf)
do
bname="${i%.*}"
ext="${i##*.}"
Y=$(cut -c1-4 <<<${bname})
X=$(cut -f1 -d "_" <<<${bname} | cut -c5-)
Z=$(cut -f2 -d "_" <<<${bname})
j="${Y}_${Z}_${X}.${ext}"
mv ${i} ${j}
done

You use 4(!) fork()s to manipulate a simple filename, which is a waste of resources. Much better: split the filename using variable expansion like you already did, but instead of splitting into name and extension (which you do not need) split into the first 4 characters and the remainder. Then simply add the additional underscore. I am sure you can work out how. (but please do not post it here until the threads o/p has responded)

I hope this helps.

bakunin
 
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