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I see that you use wget, so consider --spider option.

you can say

wget -q --spider your-url-to-check-here
echo $?
0 means file exists, 1 means file does not exist

the shebang line needs to be corrected, do not place a space between exclamation mark and slash, type it like this

#!/bin/ksh

I have to mention excellent books by Chris Johnson, you can see great posts by the author in the Shell Scripting forum here. His site have huge number of very useful scripts:
Date functions by...

I followed advise to disable multithreading in BIOS and it did help, system has been running for couple of weeks without any lockups.

I added the echo in the loop to show that when nothing matches the N??? pattern the fn variable assumes value of N??? and that is the root of the question - when using for fname in some_pattern...

I used this function for ages, don't even remember its origin:

char *conv_to_zeroes_ones(void *in)
{
register int i, pos;
unsigned int *input;
char bit;
char ...

I am not sure I got your requirements, I will just show few samples of string functions (SQL Server)

declare @str as varchar(128) = 'arr[hg19] 2q33.3q34(200,900,700-209,000,000)x2 xxx'
select...

I think questioning how to read a set of data is not exactly correct here. Rather, how to write those files. If you have an option to select in which way data will be given to you I'd much prefer...

I adjusted your original code to support N counts/accumulators (a pair per each column). I use isnum function from Wikipedia


awk '
function isnum(x){
return(x==x+0);
}
{
...

Don uses string substitution feature of bash, you can man bash and read all the details

To demonstrate:



$ a="123 abc # qwe"
$ echo ${a#*#}
qwe

$ a="123 abc + qwe"
$ echo...

You are right, removing double quotes around ${INCL} helped. Puzzle solved. Thank you!

I don't know how to tag it as solved.

The job started by a cron will have user's home directory as current directory, I'd guess when you run your commands from CLI your current directory is different; Try to add cd /your/target/dir;...

When you have isql installed, to list tables just type help and push <GO> button. Your question 2 is not clear. To query data you just type the query in the isql query area and hit <GO>, use <BLANK>...

I am sure sed is the tool to use, but just an idea - tr using character classes to delete al non-numerical characters, such as :

$ echo abc123 | tr -d [:alpha:]
123
$ echo abc123 | tr -d...

a sample script below will go through all csv files in the current directory and rename files with current date:
#!/bin/ksh
today=$(date '+%Y%m%d');
for fname in *.csv; do
...

I like paste for this kind of merges:


$ cat aa
1
line one
2
line two
3
line three
$ cat aa|paste - -
1 line one
2 line two
3 line three

Make sure to follow proper usage of this function, where on the first call the 1st argument should point to the input string, then on the following calls it should be NULL.

awk based solution

$ cat test.sh
awk '
{
if (NR == FNR) ### reading 1st file
### accumulate 2nd column values in array of key values
{
...

Yes, you have to keep a variable wich keeps number of elements in your array.

In many situations I find it convenient to hold ptr to array and counter together in one simple structure. If element...

man find
You will see it supports logical OR and AND,
for example


find $DIRECTORY/$directoryname -name "*.jpg" -o -name "*.jpeg"

Using awk you can put pairs of records together like this:


awk '{ if((NR%2) == 0) { ORS="\n"}else{ORS=" "} print}' your_file_name


This uses ORS (record separator for output) feature, for...

If your system has cron facility add a line to your crontab:

30 5 1 * * diff file1 file2 > results

This means run diff on given fies at 5:30 AM on 1st of each month and place output into file...

this script will summarize columns per first key column;


awk '{ key[$1]=$1; col1[$1]+=$2; col2[$1]+=$3; col3[$1]+=$4; col4[$1]+=$5; }
END{ for(x in key) print x, col1[x], col2[x], col3[x],...

I'd like to point out a few useful keys I had used when the connection was not stable
-t to specify retries
-c to continue download where it was aborted before
as example:
wget -c -t3 Security...

use declare -a as per bash manual
For example, here is a script that places first thre fields in three array elements

declare -a arr
while read arr[1] arr[2] arr[3];
do
echo...