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1) write a shell script that accepts filename,starting and
ending line as arguments and displays all the lines between
them.
if [ $# -lt 3 ]then echo "enter vlaid no. of arguments i.e,
Filename,starting line,endind line no." exit 1fiif [ ! -e $1 ]then
echo "file doeasnt exists" exit 1fia=`expr $2 + 1 `b=`expr $3 - 1
`#head -$b $1 | tail -n +$ased -n "$a,$b p" $1
----------------------------------------------------------------------2)write
a shell script that deletes all the lines containing a specified
word in one or more files supplied as arguments.
if [ $# -eq 0 ]then echo "enter sufficient arguments i.e, " exit
1fi n=$1shiftfor i in $*do grep -v $n $i>temp mv temp $i echo
$n
echo $idone
sh second.sh sumi filename1 filename
filename3----------------------------------------------------------------------
3) write sh script that displays a list of all the files in the
current directory to which the user has read,write and execute
permissions.
for i in *do if [ -x $i -a -w $i -a -r $i ] then echo $i
fidone----------------------------------------------------------------------shellscript
is used to receives of file names as arguments checks if every
argument supplied is a file or a directory and reports accordingly.
Whenever the argument is a file, the number of lines on it is also
reported.
for i in *do if [ -d $i ] then echo $i is a directory fi
if [ -f $i ] then echo " $i --- no. of lineS= `wc -l`"
fidone---------------------------------------------------------------------write
a shell script that accepts a list of names as its arguments,counts
and reports the occurance of each word that is present in the first
argument file on other argument files
n=$1
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shifttr'.' '\n'tempsort $n|uniq>temp1mv temp1 temp
for i in $*do echo "====> $i
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if(fp2==NULL){printf("file hasnt opened
properly");exit(1);}while((ch=fgetc(fp1))!=EOF)
fputc(ch,fp2);fclose(fp1);fclose(fp2);return
0;}---------------------------------------------------------------------c
program that copies one file to another using system calls
#includeint main(int argc,char * argv[]){int fd1,fd2;char
b[512];int n;if(argc!=3){ printf("enter sufficient nuo.of
arguments");
exit(1);}fd1=open(argv[1],O_RDONLY);if(fd1==-1){printf("file hasnt
opened
properly");exit(1);}fd2=open(argv[2],O_WRONLY|O_CREAT,0666);if(fd2==-1){printf("file
hasnt opened
properly");exit(1);}while((n=read(fd1,b,sizeof(b)))>0)
write(fd2,b,n);close(fd1);close(fd2);return 0;}
--------------------------------------------------------------------Write
a C program that redirects standard output to a file.Ex: ls >
f1.
#include#include#include#includeint main(){int fd;fd =
open("filename.txt",O_WRONLY|O_TRUNC|O_CREAT,0666);if(fd==-1){printf("file
doesnt opened");exit
(1);}dup2(fd,1);close(fd);execlp("ls","ls",NULL);printf("execl
error ouccured");return 0;}
--------------------------------------------------------------------12.
Write a C program to list all files in a directory.
#include
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#include#includeint main(int argc,char * argv[]){struct dirent
*p;DIR *d;if(argc!=2){ printf("enter sufficient nuo.of arguments");
exit(1);}d=opendir(argv[1]);chdir(argv[1]);if(d==NULL){printf("dir
is not opened
properly");exit(1);}while((p=readdir(d))!=NULL){if(strcmp(p->d_name,".")==0
|| strcmp(p->d_name,"..")==0|| ( p->d_name[0] ==
'.'))continue;printf("%s \n",p->d_name);}return 0;}
----------------------------------------------------------------------c
program which list the files in the directory and its inode
number
#include#include#includeint main(int argc,char * argv[]){struct
dirent *p;DIR *d;if(argc!=2){ printf("enter sufficient nuo.of
arguments");
exit(1);}d=opendir(argv[1]);chdir(argv[1]);if(d==NULL){printf("dir
is not opened
properly");exit(1);}while((p=readdir(d))!=NULL){if(strcmp(p->d_name,".")==0
|| strcmp(p->d_name,"..")==0|| ( p->d_name[0] ==
'.'))continue;printf("%s , %ld
\n",p->d_name,p->d_ino);}return 0;}
