Hello, i have a script which checks if the user entered 8 numeric characters in the form of YYYYMMDD (birth date). If the user entered any non numeric characters, an error will be displayed:
Code:
# Check to see if the 8 characters are all numbers
# If not show error essage
# And prompt user for more input
echo $char | grep -q '^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$'
if [ $? -ne 0 ]
then
echo "You have entered non-numeric values. Please type in the form of YYYYMMDD"
read char
continue
Is there a simpler way to write this command without using the [0-9] value for each field? Any help would be appreciated
Okay, well this is more or less my first attempt at writing a shell script.
Anyways, here's my code:
cd ${PATH}
if
then
rm ${FILE}
./anotherScript
else
exit 1
fi
exit 1
Anyways, it's a pretty simple script that is supposed to search for the... (4 Replies)
Hi,
I want to use grep inside a test statement, but I am getting an error message.
Two variables
testvarNum=5
testvarNonNum=x
echo $testvarNum | grep *
The result of this is as follows:
5
However, when I try the following (i.e. to test if the variable is numeric or non-numeric):... (3 Replies)
Hello ...again.
I am stuck on this part, I have a loop with processes an operations file.
and calls different functions depending on what is in loop, which processes a database file...
#so far my add function works as intended
add()
{
...blah blah;
}
# delete is kinda working... (13 Replies)
Hi Team,
-rwxr-xr-x 1 kmani00 system 9 Nov 08 03:29 tempfile.txt
-rwxrwxrwx 1 kmani00 devgrp 0 Nov 08 03:32 testfile.txt
by exec the following command, i did not get any output.
> test -s tempfile.txt
> a=`test -s tempfile.txt`
> echo $a
>
by exec the... (4 Replies)
Hello all,
working on Solaris 10 in ksh.
Basicly, in my function, i'm trying to test that all my unix cmd's are true (exit status 0) else you flag the rcControlRule to 1 without going into spagetti mode code testing every $? in a if statement.
The mdb is probably a little tricky cause it... (3 Replies)
I have a list of files like below, Do we have grep command to find files?
If i grep 03874 it should display the file 3874, Grep command should ignore 0 at the beginning. There could be more many leading 0's in filename.
$ ls -ltr
total 5
-rw-r--r-- 1 mqm mqm 15 Feb 19 17:07 4769... (3 Replies)
I want to xheck if a file exists that uses wildcards as only the partial filename is known using the test Command, and when it exists then output just the number of lines in the file... do not include the filename. Then this output, is it captured by the CommandOutput or the ReturnValue as I want... (2 Replies)
As an exercise, I'm trying to re-write this code without the compound square brackets, using grep and test. Need to know what to do about the "equal-tilde".
#!/bin/bash
# test-integer2: evaluate the value of an integer.
INT=-5
if +$ ]]; then
if ; then
echo "INT is zero."
else
if ; then... (17 Replies)
Discussion started by: Xubuntu56
17 Replies
LEARN ABOUT LINUX
pstree.x11
PSTREE(1) User Commands PSTREE(1)NAME
pstree - display a tree of processes
SYNOPSIS
pstree [-a, --arguments] [-c, --compact] [-h, --highlight-all, -Hpid, --highlight-pid pid] [-g] --show-pgids] [-l, --long]
[-n, --numeric-sort] [-N, --ns-sortns [-p, --show-pids] [-s, --show-parents] [-S, --ns-changes] [-t, --thread-names] [-T, --hide-threads]
[-u, --uid-changes] [-Z, --security-context] [-A, --ascii, -G, --vt100, -U, --unicode] [pid, user]
pstree -V, --version
DESCRIPTION
pstree shows running processes as a tree. The tree is rooted at either pid or init if pid is omitted. If a user name is specified, all
process trees rooted at processes owned by that user are shown.
pstree visually merges identical branches by putting them in square brackets and prefixing them with the repetition count, e.g.
init-+-getty
|-getty
|-getty
`-getty
becomes
init---4*[getty]
Child threads of a process are found under the parent process and are shown with the process name in curly braces, e.g.
icecast2---13*[{icecast2}]
If pstree is called as pstree.x11 then it will prompt the user at the end of the line to press return and will not return until that has
happened. This is useful for when pstree is run in a xterminal.
Certain kernel or mount parameters, such as the hidepid option for procfs, will hide information for some processes. In these situations
pstree will attempt to build the tree without this information, showing process names as question marks.
OPTIONS -a Show command line arguments. If the command line of a process is swapped out, that process is shown in parentheses. -a implicitly
disables compaction for processes but not threads.
-A Use ASCII characters to draw the tree.
-c Disable compaction of identical subtrees. By default, subtrees are compacted whenever possible.
-G Use VT100 line drawing characters.
-h Highlight the current process and its ancestors. This is a no-op if the terminal doesn't support highlighting or if neither the
current process nor any of its ancestors are in the subtree being shown.
-H Like -h, but highlight the specified process instead. Unlike with -h, pstree fails when using -H if highlighting is not available.
-g Show PGIDs. Process Group IDs are shown as decimal numbers in parentheses after each process name. -g implicitly disables com-
paction. If both PIDs and PGIDs are displayed then PIDs are shown first.
-l Display long lines. By default, lines are truncated to either the COLUMNS environment variable or the display width. If neither of
these methods work, the default of 132 columns is used.
-n Sort processes with the same ancestor by PID instead of by name. (Numeric sort.)
-N Show individual trees for each namespace of the type specified. The available types are: ipc, mnt, net, pid, user, uts. Regular
users don't have access to other users' processes information, so the output will be limited.
-p Show PIDs. PIDs are shown as decimal numbers in parentheses after each process name. -p implicitly disables compaction.
-s Show parent processes of the specified process.
-S Show namespaces transitions. Like -N, the output is limited when running as a regular user.
-t Show full names for threads when available.
-T Hide threads and only show processes.
-u Show uid transitions. Whenever the uid of a process differs from the uid of its parent, the new uid is shown in parentheses after
the process name.
-U Use UTF-8 (Unicode) line drawing characters. Under Linux 1.1-54 and above, UTF-8 mode is entered on the console with echo -e
' 33%8' and left with echo -e ' 33%@'
-V Display version information.
-Z (SELinux) Show security context for each process. This flag will only work if pstree is compiled with SELinux support.
FILES
/proc location of the proc file system
BUGS
Some character sets may be incompatible with the VT100 characters.
SEE ALSO ps(1), top(1).
psmisc 2016-06-18 PSTREE(1)