In Unix, WHILE command, I am trying to read a file, which is in another directory. But somehow not working, not even throwing any error.
while read line
do
echo $line
done < /tmp/myfile.txt
The file is present in /tmp folder, has all the permissions.
It is not clear why your while loop is not working. Normally loops, if condition syntax are different for different shell. Hence at the beginning of a shell script file we always define the shell where exactly this script should run and that first line is start with a #. Now do the following and check that might help you.
create a file $vi test.sh
put the below line in it
#!/usr/bin/ksh
filename="/tmp/myfile.txt"
while [ 1 ]
do
read -r line
if [ ${line:-1} -eq 1 ]; then
break
else
echo $line
fi
done < "$filename"
or
#!/usr/bin/ksh
filename="/tmp/myfile.txt"
while read -r line
do
echo $line
done < "$filename"
save the file and set the permission like below
$chmod 777 test.sh
now run the file
$./test.sh
Related
I am trying to find if files in a directory, output of ls, exists in a file. So I have a file called test.txt inside this file I have few filenames like, V1.txt,v2.txt, v3.txt.
Now when I do ls I find list of files in the directory, I want to search if any of these files are on my test.txt file.
Example:
Sounds like you got two tasks you want to do.
1) loop through directory listing
2) search text file for any of the names of files that were in the directory
Test Setup
echo "V1.txt" > file_list.txt
echo "V2.txt" >> file_list.txt
mkdir testdir
touch testdir/V1.txt
touch testdir/V2.txt
touch testdir/V3.txt
Code
#!/bin/bash
for f in `ls testdir`
do
if grep -q $f file_list.txt; then
echo "found $f"
else
echo "not found $f"
fi
done
I am in root directory, i am creating a script that will take me from root > Home > Logs and inside logs delete 3 log files.
Script will check if they exist, if YES it will delete it.
I am facing some syntax problems if you could help.
Thanks
My code:
#!/bin/sh
cd Home/Log
if [ -e error1.log ]
then
rm error1
fi
if [ -e error2.log ]
then
rm error1
fi
if [ -e error3.log ]
then
rm error1
fi
when i execute the file in root using ./delete here is what is am getting as errors:
$ ./delete
: No such file or directoryme/Log
./delete: line 14: syntax error near unexpected token `fi'
I am in root directory
When writing a script, it's almost always better not to assume things like that. If you know where the files are and it's not important that they're somewhere relative to what happens to be your current working directory, just name them.
Here are three ways you could accomplish what you want safely.
#!/bin/sh
dir=/Home/Log
rm -f ${dir}/error1.log ${dir}/error2.log ${dir}/error2.log
or
#!/bin/sh
dir=/Home/Log
rm -f ${dir}/error{1,2,3}.log
or
#!/bin/sh
set -e
cd /Home/Log && rm -f error1.log error2.log error2.log
For anything nontrivial, set -e is your friend. In your example, nothing happens later in the script. What you don't want is to keep going thinking you've changed directories, but haven't, and wind up scribbling somewhere you didn't intend. Many have lost much that way.
I am coping some file,So, the result can be either way.
eg:
>cp -R bin/*.ksh ../backup/
>cp bin/file.sh ../backup/bin/
When I execute above commands, its getting copied. No response from the system, if it copied successful. If not, prints the error or response in terminal itself cp: file.sh: No such file or directory.
Now, I want to log the error message, or if it successful I want to log my custom message to a file. How can I do?
Any help indeed.
Thanks
try writing this in a shell script:
#these three lines are to check if script is already running.
#got this from some site don't remember :(
ME=`basename "$0"`;
LCK="./${ME}.LCK";
exec 8>$LCK;
LOGFILE=~/mycp.log
if flock -n -x 8; then
# 2>&1 will redirect any error or other output to $LOGFILE
cp -R bin/*.ksh ../backup/ >> $LOGFILE 2>&1
# $? is shell variable that contains outcome of last ran command
# cp will return 0 if there was no error
if [$? -eq 0]; then
echo 'copied succesfully' >> $LOGFILE
fi
fi
Im new to unix,I have search a lot of info but still don not how to make it in a bash
What i know is used this command ls -tr|xargs -i ksh -c "mv {} ../tmp/" to move file by file.
Now I need to make a script that sorts all of these files by system date and moves them into a directory, The first 1000 oldest files being to be moved.
Example files r like these
KPK.AWQ07102011.66.6708.01
KPK.AWQ07102011.68.6708.01
KPK.EER07102011.561.8312.13
KPK.WWS07102011.806.3287.13
-----------This is the script tat i hv been created-------
if [ ! -d /app/RAID/Source_Files/test/testfolder ] then
echo "test directory does not exist!"
mkdir /app/RAID/Source_Files/calvin/testfolder
echo "unused_file directory created!"
fi
echo "Moving xx oldest files to test directory"
ls -tr /app/RAID/Source_Files/test/*.Z|head -1000|xargs -i ksh -c "mv {} /app/RAID/Source_Files/test/testfolder/"
the problem of this script is
1) unix prompt a syntax erro 'if'
2) The move command is working but it create a new filename testfolder instead move to directory testfolder (testfolder alredy been created in this path)
anyone can gv me a hand ? thanks
Could this help?
mv `ls -tr|head -1000` ../tmp/
head -n takes the n first lines of the previous command (here the 1000 oldest files). The backticks allow for the result of ls and head commands to be used as arguments to mv.
I'm not sure why this code isn't working. Its not going to the copy command.
I successfully run this manually on the command line (without the check)
I don't think i'm performing a correct file check? Is there a better, cleaner way to write this?
I just want to make sure the file exists, if so, copy it over. Thanks.
#!/bin/bash
if [ $# != 1 ]; then
echo "Usage: getcnf.sh <remote-host>" 2>&1
exit 1
fi
#Declare variables
HOURDATE=`date '+%Y%m%d%H%M'`
STAMP=`date '+%Y%m%d-%H:%M'`
REMOTE_MYCNF=/var/log/mysoft/mysoft.log
BACKUP_DIR=/home/mysql/dev/logs/
export REMOTE_MYCNF HOURDATE STAMP
#Copy file over
echo "Checking for mysoft.log file $REMOTE_MYCNF $STAMP" 2>&1
if [ -f $REMOTE_MYCNF ]; then
echo "File exists lets bring a copy over...." 2>&1
/usr/bin/scp $1:$REMOTE_MYCNF $BACKUP_DIR$1.mysoft.log
echo "END CP" 2>&1
exit 0
else
echo "Unable to get file" 2>&1
exit 0
fi
your checking existing file on remote computer seems like:
you should do:
ssh $host "test -f $file"
if [ $? = 0 ]; then
use sh -x script.sh to see what is happening.
You are testing for the existence of a remote file
$1:$REMOTE_MYCNF
using the local name $REMOTE_MYCNF. The if test is never satisfied.
You don't check that $1 is set.
Your file check runs on the local machine - not on the remote.
Change your if to:
if[! -f $REMOTE_MYCNF -o ! -d $REMOTE_MYCNF];