Hello! i try to understand the art of bash scripting but unfortunately, more i try and less i understand it.
Can someone tell me how i can learn its logic? i will give you an example why its making me crazy. Look at this basic script:
my for loops are working like this, but it took me more than one hour because "for" is not in yellow. Is it a bug?
I also need help to compare table items in the second for loop.
Please don't give me another way to do it, i just try to understand syntax logic.
I swear i've tried to do it alone but no way.
Sorry, i m not good in english
ps: in fact, the first for loop is working, the second give an an error. Of course i 've changed the second one.
I'm trying to write a simple script that takes all the .tar.gz files in a directory and verifies them by using the gzip -tv command:
for zip in *.tar.gz
do
gzip -tv $zip
if ; then #Check return code from tar
echo "File ${zip} verified OK."
exit... (4 Replies)
I am trying to create a shell that asks the user to enter their name, and compare it to my own by saying we have the same name or saying my name and that they have a nice name too. Here is my script...
#!/bin/bash-x
echo "Enter your name".
read name
if
then
echo "My name is Adam too"... (1 Reply)
I have a script that's meant to check the disk usage on a particular volume and delete the oldest logfile if it's over a certain percentage. It runs fine on a Linux machine, but on a Solaris one, I get this error:
diskspace_check.sh: syntax error at line 3: `diskspace=$' unexpected
I assume... (2 Replies)
I'm running mysql in a bash script
mysql <<EOF
query
EOF
one query is like this:
UPDATE $dbname.$prefix"config" SET value = $var WHERE "$prefix"config.name = 'table colname';
with variable
but it's giving an error
i'm not sure what to put for
"$prefix"config.name
the table... (3 Replies)
Hello.
In the following :
RESTORE_FF contain a file name : a_file.tar.gz
I am testing in a directory if "a_file.tar.gz" exists and or if any file like "a_file.tar.gz" exists.
So "a_file.tar.gz" will give me file exists
So "a_file.tar.gz." will give me file exists
So... (5 Replies)
ec2addtag --region us-west-1 vol1234 --tag Name=$nameinst;
It should execute
ec2addtag --region us-west-1 vol1234 --tag Name=webserver;
Instead it thinks that Name is equal to that variable. Please help. Thanks!
Please use code tags! (0 Replies)
Hello,
I have seen this syntax,
{ ;;};quite often and I don't know what it means exactly.
It seems like a distinctive thing of Bash, so it's been used for the logo of the last bug,
ShellShock: All you need to know about the Bash Bug vulnerability | Symantec Connect
I have also seen... (3 Replies)
The below bash function uses multiple variables CODING, SAMPLE, SURVEY, andvariant
in it. The user selects the cap function and details are displayed on the screen using the $SURVEY variable, the directory is changed to $SAMPLE and the samples.txt is opened so the user can select the sample to... (6 Replies)
I am sharing a code snippet.
for (( i=0; i<=$(( $count -1 )); i++ ))
do
first=${barr2}
search=${barr1}
echo $first
echo "loop begins"
for (( j=0; j<=5000; j++ ))
do
if } == $search ]]; then
echo $j
break;
fi
done
second=${harr2}
echo $second (2 Replies)
Discussion started by: ngabrani
2 Replies
LEARN ABOUT DEBIAN
gmt_shell_functions
GMT_SHELL_FUNCTIONS.SH(1gmt) Generic Mapping Tools GMT_SHELL_FUNCTIONS.SH(1gmt)NAME
gmt_shell_functions.sh - Practical functions to be used in GMT bourne shell scripts
SYNOPSIS
gmt_init_tmpdir
gmt_remove_tmpdir
gmt_clean_up [prefix]
gmt_message message
gmt_abort message
gmt_nrecords file(s)
gmt_nfields string
gmt_get_field string
gmt_get_region file(s) [options]
gmt_get_gridregion file [options]
gmt_get_map_width -R -J
gmt_get_map_height -R -J
gmt_set_psfile file
gmt_set_framename prefix framenumber
gmt_set_framenext framenumber
DESCRIPTION
gmt_shell_functions.sh provides a set of functions to Bourne (again) shell scripts in support of GMT. The calling shell script should
include the following line, before the functions can be used:
. gmt_shell_functions.sh
Once included in a shell script, gmt_shell_functions.sh allows GMT users to do some scripting more easily than otherwise. The functions
made available are:
gmt_init_tmpdir
Creates a temporary directory in /tmp or (when defined) in the directory specified by the environment variable TMPDIR. The name of
the temporary directory is returned as environment variable GMT_TMPDIR. This function also causes GMT to run in `isolation mode',
i.e. all temporary files will be created in GMT_TMPDIR and the .gmtdefaults file will not be adjusted.
gmt_remove_tmpdir
Removes the temporary directory and unsets the GMT_TMPDIR environment variable.
gmt_cleanup
Remove all files and directories in which the current process number is part of the file name. If the optional prefix is given then
we also delete all files and directories that begins with the given prefix.
gmt_message
Send a message to standard error.
gmt_abort
Send a message to standard error and exit the shell.
gmt_nrecords
Returns the total number of lines in file(s)
gmt_nfields
Returns the number of fields or words in string
gmt_get_field
Returns the given field in a string. Must pass string between double quotes to preserve it as one item.
gmt_get_region
Returns the region in the form w/e/s/n based on the data in table file(s). Optionally add -Idx/dy to round off the answer.
gmt_get_gridregion
Returns the region in the form w/e/s/n based on the header of a grid file. Optionally add -Idx/dy to round off the answer.
gmt_map_width
Expects the user to give the desired -R -J settings and returns the map width in the current measurement unit.
gmt_map_height
Expects the user to give the desired -R -J settings and returns the map height in the current measurement unit.
gmt_set_psfile
Create the output PostScript file name based on the base name of a given file (usually the script name $0).
gmt_set_framename
Returns a lexically ordered filename stem (i.e., no extension) given the file prefix and the current frame number, using a width of
6 for the integer including leading zeros. Useful when creating animations and lexically sorted filenames are required.
gmt_set_framenext
Accepts the current frame integer counter and returns the next integer counter.
NOTES
1. These functions only work in the bourne shell (sh) and their derivatives (like ash, bash, ksh and zsh). These functions do not work in
the C shell (csh) or their derivatives (like tcsh), and cannot be used in DOS batch scripts either.
2. gmt_shell_functions.sh were first introduced in GMT version 4.2.2 and have since been regularly expanded with other practical scripting
short-cuts. If you want to suggest other functions, please do so by mailing to the GMT mailing list: gmt-help@lists.hawaii.edu.
SEE ALSO GMT(1), sh(1), bash(1), minmax(1), grdinfo(1)GMT 4.5.7 15 Jul 2011 GMT_SHELL_FUNCTIONS.SH(1gmt)