Made some basic utilites for cross-plattform usage, as well as for unified and simplified usage.
Reused and wraped RudiC's echo_, thanks again
Code:
#
# Some tools
#
swarm.util.isRoot() { #
# Returns TRUE if user ID is 0
# Returns FALSE otherwise
if [[ ${UID:-${EUID:-0}} -eq 0 ]]
then $ECHO true
return 0
else $ECHO false
return 1
fi
}
swarm.util.isGUI() { #
# Returns TRUE if XDG_CURRENT_DESKTOP, DESKTOP_SESSION or XAUTHORITY is set
# Returns FALSE otherwise
if [[ -n "${XDG_CURRENT_DESKTOP:-${DESKTOP_SESSION:-$XAUTHORITY}}" ]]
then $ECHO true
return 0
else $ECHO false
return 1
fi
}
swarm.util.mkdir() { # /path/to/make
# Creates full path structures
#
${isRO:-false} && return 1
# Remove any possible args from ARGS
while [[ "-" == "${1:0:1}" ]] ; do shift ; done
swarm.protect "$FUNCNAME" "${@}" && return 1
# Vars
local dir_done=""
local dir_todo=$($PRINTF "${1:1}" | $SED s,"/","\n",g)
# Start pipe
$PRINTF '%s\n' "$dir_todo" | while read current
do # Prepare next dir
dir_done+="/$current"
# Create if not exist
[[ -d "$dir_done" ]] || $MKDIR "$dir_done"
done
return 0
}
swarm.util.echo() { # [-e|-n|-en|-ne] STRING
# Simple echo's, by RudiC @ unix.com
#
echo_(){
( IFS=" "; $PRINTF "%s\n" "$*" )
}
# Portable echo -n
echo_n() {
( IFS=" "; $PRINTF "%s" "$*" )
}
# Portable echo -e
echo_e() {
( IFS=" "; $PRINTF "%b\n" "$*" )
}
# Portable echo -ne
echo_ne() {
( IFS=" "; $PRINTF "%b" "$*" )
}
case "${1/-}" in
"n") shift ; echo_n "${@}" ;;
"e") shift ; echo_e "${@}" ;;
"en"|"ne")
shift ; echo_ne "${@}" ;;
*) echo_ "${@}" ;;
esac
}
swarm.util.isDir() { # /path/to/dir
# Returns true if passed string is a directory
#
[[ -d "$1" ]]
return $?
}
#
# Short variable access to util functions
# and to keep file usage to a minimum
#
isRoot=$(swarm.util.isRoot)
isGUI=$(swarm.util.isGUI)
isDir="swarm.util.isDir"
MKDIR="swarm.util.mkdir"
ECHO="swarm.util.echo"
But currently I'm still busy in re-thinking/doing the init procedure....
Well, unifying (is that a word??) the procedure of using functions to do different checks, keep/put all variables to RAM while put some essential ones (usage speed increase / customize options) in the 'rc' file.
The specific part of preparing configuration files & folders that are optional - because it must run on a Read-Only system as well, is quite more challenging than making it just in a "must-be-installed" way.
Also, with my... crazy... idea of implementing an optional ramdisk support (as root, for configuration and tempfiles only) didnt make the init procedure any easier.
Further, I need to 'bypass' the (so far hardcoded) use of /root because not all systems have it, thus I have to place the configfile (swarmrc) in another place, like using '/etc' if root has no $HOME.
this is the output i am getting here..
cp: cannot create /wls_domains/eoigw/eoigwsA/deliv/cron/MailingScript/eoigwsA_Health_Status_Report.html: Permission denied
/wls_domains/eoigw/eoigwsA/deliv/cron/MailingScript/
/wls_domains/eoigw/eoigwsA/deliv/cron/MailingScript/GenerateReport.sh:... (6 Replies)
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Hello!
I would like to create a blog website on a web domain of mine. The blog will be used for publishing economics-lated articles.
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Hi all,
Can I create multiple threads using single thread_id
like
pthread_t thread_id;
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pthread_create(&thread_id, NULL, &print_ys, NULL);
pthread_create(&thread_id, NULL, &print_zs, NULL);
pthread_join(thread_id, NULL);
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Hi,
I am trying to capture runtime stats of a shell script (c shell). Are there system variables to call? Or should I create a date variable at the start of the script and at the end of the script? I am trying to capture the time if the script stops or ends with error.
Please help.
... (4 Replies)
Hello,
My requirement is based on Oracle where we run a perl script and it asked some questions.I want to write a wrapper which will answer all these questions.
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Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
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I have shell script that I am running under Ubuntu as root.
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Discussion started by: naveedanwar4u
4 Replies
LEARN ABOUT DEBIAN
pivot_root
PIVOT_ROOT(8) System Administration PIVOT_ROOT(8)NAME
pivot_root - change the root filesystem
SYNOPSIS
pivot_root new_root put_old
DESCRIPTION
pivot_root moves the root file system of the current process to the directory put_old and makes new_root the new root file system. Since
pivot_root(8) simply calls pivot_root(2), we refer to the man page of the latter for further details.
Note that, depending on the implementation of pivot_root, root and cwd of the caller may or may not change. The following is a sequence for
invoking pivot_root that works in either case, assuming that pivot_root and chroot are in the current PATH:
cd new_root
pivot_root . put_old
exec chroot . command
Note that chroot must be available under the old root and under the new root, because pivot_root may or may not have implicitly changed the
root directory of the shell.
Note that exec chroot changes the running executable, which is necessary if the old root directory should be unmounted afterwards. Also
note that standard input, output, and error may still point to a device on the old root file system, keeping it busy. They can easily be
changed when invoking chroot (see below; note the absence of leading slashes to make it work whether pivot_root has changed the shell's
root or not).
EXAMPLES
Change the root file system to /dev/hda1 from an interactive shell:
mount /dev/hda1 /new-root
cd /new-root
pivot_root . old-root
exec chroot . sh <dev/console >dev/console 2>&1
umount /old-root
Mount the new root file system over NFS from 10.0.0.1:/my_root and run init:
ifconfig lo 127.0.0.1 up # for portmap
# configure Ethernet or such
portmap # for lockd (implicitly started by mount)
mount -o ro 10.0.0.1:/my_root /mnt
killall portmap # portmap keeps old root busy
cd /mnt
pivot_root . old_root
exec chroot . sh -c 'umount /old_root; exec /sbin/init'
<dev/console >dev/console 2>&1
SEE ALSO chroot(1), mount(8), pivot_root(2), umount(8)AVAILABILITY
The pivot_root command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux February 2000 PIVOT_ROOT(8)
04-09-2020
