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# 1  
Old 05-17-2005
delete line in a file

Hi all,
I would like to delete a line in file.txt which has a list of filename.
example:
file_a
file_b
file_c

lets say i have file_b in my directory, then i should delete file_b in file.txt and get output file.txt with only file_a and file_b.

Below is my script, my result is still
file_a
file_b
file_c
Anyone can help???
Smilie Smilie Smilie
#!/bin/bash
while read line
do
if [[ -r $line ]]
then
sed -e '/$line/d' $1 > $1.tmp
mv $1.tmp $1
else
echo "file not readable"
fi
done < $1
# 2  
Old 05-17-2005
while read line

waits for your input each time. Is that what you need ? Or do you need a script which will check your file contents against the directory listing and then carry out your requirement.

vino
# 3  
Old 05-17-2005
MySQL Try this

sed '/file_b/d' file.txt > new_file.txt
# 4  
Old 05-17-2005
Quote:
Originally Posted by RishiPahuja
sed '/file_b/d' file.txt > new_file.txt
just wandering, is there a way to delete the line out of "file.txt" without having to redirect it to a "new_file.txt" , or do we have flush "file.txt" and copy "new_file.txt" into it?
# 5  
Old 05-17-2005
Quote:
Originally Posted by strike
just wandering, is there a way to delete the line out of "file.txt" without having to redirect it to a "new_file.txt" , or do we have flush "file.txt" and copy "new_file.txt" into it?
/bin/echo "/$line/d\nwq!" | ex -s file.txt
# 6  
Old 05-17-2005
yep that works. i was just curious
why does this work
/bin/echo "/$line/d\nwq!" | ex -s file.txt
but not this?
echo "/$line/d\nwq!" | ex -s file.txt
# 7  
Old 05-17-2005
Quote:
Originally Posted by strike
yep that works. i was just curious
why does this work
/bin/echo "/$line/d\nwq!" | ex -s file.txt
but not this?
echo "/$line/d\nwq!" | ex -s file.txt
'echo' is a built-in in bash/ksh which has a different syntax than the /bin/echo

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